I tip, and I tip well. I've been known to give $5 to pizza deliverers and tip well at sit-down restaurants.
My grandparents don't tip, at all. It's embarrassing. Sometimes when we're leaving they refuse to tip, so I have to lay some money down for our waiter or waitress. Big jerk faces.
My dad tips, but it's not a lot.
Do you tip? How much do you tip?
(I'm asking this 'cause I just ordered pizza. )