I’ve made it a point never to grumble, grouse, or argue with certain people. Waiters. Cops. Plumbers. Mechanics. Postman. Among the 20 Secrets Your Waiter Will Never Tell You:

#1 - We’re not allowed to tell our customers we don’t like a dish. So if you ask your server how something is and she says, “It’s one of our most popular dishes,” chances are she doesn’t like it.

An honest opinion requires a bigger tip.

#20 - If you walk out with the slip you wrote the tip on and leave behind the blank one, the server gets nothing. It happens all the time, especially with people who’ve had a few bottles of wine.

I didn’t know that.