When I am being served I try to see the name tag..when the meal is brought I tell the waiter that we are about to say grace and ask if there is anything that they would like prayer for..the reactions are priceless...usually a big smile..and a "wait a minute..let me see" followed by some prayer need. I have heard some serious needs guys..this is a hurting world.
So I would not want them to think Christians are cheap..a good tip follows.. (Plus a prayer card if I have one on me that shows Jesus holding a man in contempory clothing with a mallet in his hand)
So a BIG tip is in order..