Our 1st trip to 50's, DH had to get up and sing "I'm a Little Teapot" for having his elbows on the table - twice (had to sing once - elbows on the table twice). Another time, he had to stand in the corner for something. Our kids think it's hilarious!!!
I think alot of servers try to get a "feel" for the customers and if they have a sense of humor.