1.) You pay with a $100 bill and don’t tip
2.) If it’s free, you want more of it
3.) You give off a blank stare when you are asked to order rather than just asking for another minute to decide
4.) You order water; all with lemon!
5.) You use a coupon or get a discount and then do not tip the full amount
-Jessica
Break Room Stories 
I’m guilty of having done the blank stare a time or two. lol
I was a waitress for 6 months when I was 17…I have the upmost respect for waiters and waitresses. If people cannot tip decently, they should stay home!
Luckily we don’t tip here it’s not the custom. You can offer to get him a drink, I guess, but it’s pretty unusual.