It really annoys me when...:
I'm standing in line, and I end up with a cashier that
has to start a conversation with me about every item in your shopping cart. A trip that would ideally take less than 5 minutes is now stretched to 20. I just want to have my stuff bagged so I can leave!
People decide to get the one item on the shelf that doesn't have a tag on it, then get made when it cant be scanned at the register and make a scene.
I see people who are obsessed with sale items and get upset when they arrive on the last day of the sale and Whoopty doo, all the sale items are gone!
Shoppers who get their friends/family to take advantage of those "limit, 1 per customer" sales by getting like 10 people to do it, and they all go to the same line and it's soooooooo obvious what they're doing(my parents make me help them do this whenever I visit and it realllllyyyy bugs me)