This. Site. Is. EPIC.

[Eltu]

You gotta check this out:

Not Always Right | Funny & Stupid Customer Quotes

I spent the whole evening reading through this site. It's just that epic.
It contains examples of really, really stupid customers from all over the world. An example:

Customer: “Can you help me please?”
Me: “Yes, of course, what can I do for you?”
Customer: “Well, I want to buy some food for my cat, but mine doesn’t look like the one on the packet. Can I still feed it to him?”
Me: “Yes sir, of course.”
Customer: “Wow, really? Thanks!”

And it gets worse. Much worse.