Okay, some background first of all. I work as a customer service rep for a company which does repairs on computers on behalf of manufacturers. What my job entails is speaking to customers over the phone to arrange for their computers to come in for repair. I also deal with complaints and problems. Before they come through to me, the customers have spent a time speaking to some technical support folks to try and determine what the problem is, and if it software based (in which case they will repair it over the phone) or wether it is hardware based (in which case it's my time to shine!), and, if hardware, wether it's in-warranty (i.e a problem with the materials or manufacturing, which means free repairs all round) or non-warranty (i.e if Little Jacob has attempted to feed the CD drive some peas, in which case they have to pay). If it's hardware, they come through to me and I send out a courier to pick up their computar machien. Before the courier will collect it, they need the machine to be packed in a box with some internal packaging like bubble-wrap so that it won't get damaged (the courier's insurance won't cover any in-transit damage if the customers don't pack the units properly so we're quite insistent about this). We also try to keep the customers updated with repair progress as well, and quote those clowns who come through as non-warranty folks.
This is the worst job in the world, or at least the worst job I've ever had (and I was in the army). I really don't like it at all. Here are some examples of why my job is one of the worst in the world:
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EDIT: I added some artist's impressions of what I think the customers looked like using the smileys.
I called a customer one day to explain to him that his motherboard, graphics card and sound card were not replaceable in warranty because they were full of moisture which had caused them to burn out. I quoted him the (admittedly extortionate) repair charges, and he threw a hissy fit. "Why should I pay??" he screamed, "I have done nothing wrong!!" "But sir", I replied, "Your computer is full of moisture stains. This moisture has gotten onto the circuits and caused them to burn out. This is not a manufacturing defect it is your fault, so I am afraid you must pay!" Man was not happy. He could not see how the moisture had gotten onto his circuits. "Have you spilled onto the unit, sir?" I enquired, expecting the answer no. Man did not disappoint. "No!", he said, "The only thing I have done recently is fixed the fan!!"
"The fan, you say? Please, do-tell."
"Well sir", he says, "The main fan was squeaking loudly. Being a motor mechanic, I know how best to deal with such an emergency; I removed the cover and sprayed a miniscule amount of WD-40 (water dispersal spray for those who don't know, made of oil primarily, you use it on spark-plugs when they're damp or on squeaky hinges) onto the fan!!! I will not pay your repair charges!!"
Immediately it dawned on me what had happened. Being the clever chap that he was, he had sprayed this oil onto the fan in the hope that it would stop the noise, meaning that the next time it span up it spattered the inside of his computer with oil. The traces on the circuit board had then heated up (as they do) and heated the oil to frying temperature, which then fricaseed his computer. I informed him of this, and he went on to tell me I had no idea what I was talking about and swore at me several times. He then informed me he was taking this to his solicitor, and slammed the phone down.
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:
"Hi, I have received a letter saying that you will not repair my laptop because it is covered in a sticky substance. Has this affected the repair?"
Me:
"No, it is in warranty because as far as we can tell it should not have made your hard drive crash. However, since it is giving off a strong smell of urine, our engineers are unwilling to repair or even touch your unit."

:
"Don't worry about that. Myinfant son may have urinated onto the laptop before I sent it away, or possibly my cat. It is not harmful, please continue with my repair."
Me:
"No, I will now make arrangements to have this unit returned to you so that you can clean it before we touch it."

:
"I am not happy! It is only a bit of wee! I demand to speak to your manager!!"
So I put him through, and the manager there and then told him that he could expect his unit back unrepaired within the next 12 hours, so he could clean the p*ss off it to allow us to collect it again and repair it without our engineers having to touch the feculence. He then hung up on my manager and rang the manufacturers; who then rang me back and demanded we fixed the customer's unit whilst it was covered in wee otherwise they would pull the contract.....
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:
"Hi, have you got my unit in there?"
Me:
"Yes, we have ordered a processor for it. It should be here tomorrow, you'll have it back before the weekend."

:
"Okay, that's fine, but you can't take the cover off."
Me:
"Erm.. come again?"

:
"Don't remove the cover! There are private things in there."
Me:
[Struggling to comprehend what he was going on about, I assumed he was talking about the information on the hard drive]
"But sir, your hard drive information is safe. We cannot access it unless we start up--"

:
"I am aware of that, I am not stupid!! What I mean is that there are private things stored inside the casing, and I do not consent to you removing the casing!!"
Me:
"We have to to replace the processor!"

:
"NO YOU DON'T I KNOW MORE ABOUT COMPUTERS THAN YOU YOU ARE A MORON THERE IS A PORT IN THE BACK PUT IT IN THERE DO NOT REMOVE THE COVER!!"
Me:
"I'm sorry, we have to."

:
"Put me through to your manager."
So I did, and the manager agreed with me, so Man rang the manufacturers who also agreed with me (for a change). The processor came and we removed the casing only to find that he had a large bag of what we assumed was cocaine taped to the inside of the casing, which he had neglected to remove before it came into us. His computer was passed to the police, and he tried to blame us for planting it. Nice try there, Druggie Dan!
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:
"MY DOG CHEWED SOMETHING ON THE COMPUTER AND NOW IT IS BROKEN THIS WAS NOT MY FAULT I DEMAND TO NOT PAY!!"
Me:
"Is dog-chew a valid manufacturing defect?"

:
"NO BUT--"
Me:
"Then it's out of warranty."
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:
"You have recently returned my computer to me after a repair on the dial-up modem, however now my son cannot use the internet. He tried to connect it said there is no dial tone I want to speak to the Managing Director of the company immediately I will take you to court and you will all die!"
Me:
"Have you checked the connections between the computer and the phone line?"

:
"Don't insult my intelligence! I checked all those whilst I was on the phone to tech support!"
Me:
"Were you trying to connect to the internet whilst using the telephone?"

:
"YES!!!!"
Me:
"I am perturbed by your stupidity."
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There are more, but I cannot be bothered to type them out. Please, if any of you out there hate your jobs as much as I do, share your pain so that it may help to alleviate mine.