If you've never been a cashier (or just haven't been behind the register in a minute), here's what a day in the life is like with crazy customers, random returns, and annoying credit card machines. We checked out the subreddits for a bunch of stores and grabbed a little sampling from each! Cashiers should all be paid $1000 per hour and should get to sit while they work. If someone messes up the clothes you're folding at your workplace, you should be allowed to lightly bop them on the head with…