We get people laughing at the stupidest things.
A prime example is this: Many customers will laugh when their total purchase ends in 69 cents.
Why? Why do people do this??
And it's not like it's teenagers or anything. It's always GROWN MEN that chuckle to themselves.
When they do this all I can do is stare at them with my 'You're an idiot' look. Do they not get enough attention from their wives or girlfriends at home that something like this actually amuses them?
The worst is when they actually say something about it. "Oh heh heh heh. 69. Do you see that?"
"Yeah, asshole, I see. Just pay me and get out."
Here's another piece of advice. If your total ends in 69, don't comment on it to the cashier. Just hold your laughter in as best as you can (because it is SO funny), and wait until you are outside before you burst out laughing.