I probably fail to tip a lot of different people that I should. The dental hygienist? Toll booth operators? Where does it end?

Four years a bit shop employee/mechanic, only got one "tip" when a customer gave me a couple of tickets to something, maybe a concert or sporting event (maybe he just did not want to go?)

That said, the place where I get my car serviced saves me a lot of money versus the dealer, very friendly, small place so it's 100% always the same people. Last month, when the office guy was totaling up the bill, I said to put another $25 on it "I'm paying for pizza today". I do not plan to do that every time.