The only one that really annoyed me a lot is when people spend hours (okay minutes) looking for exact change.
But I've had a customer do these things...
1. Refuse to buy a product made in China, not because it was killing US jobs, or anything. BUt because one time she brought something from China and it broke or something. Then she went on and on about it.
2. Literally claimed she slipped in a tiny amount of water on the floor so she could sue the store.
3. Asked if I had any two dollar bills in my register.
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Chrono1219
The beautiful genius who graduated from Harvard as a child and has an IQ of 1.3^googolplex.