Things I don't like to hear/see while standing in line at the grocery store:
1. "Can you ring these up separately?" even better..."Can I get three separate receipts?"
2. Someone who takes out his/her checkbook after all the items are rung up
3. "Can I get six cartoons of __ cigarettes?...they're locked up."
4. "Manager's key on six...override please."
5. Shopping cart filled to the brim, when I all I have is a banana. (Thanks for not letting me go in front of you.)