I work at a sushi joint, and we're instructed to say 'thank you' when we take a person's money and thank them for coming.

In Canada, we say thank you and sorry every other word. I'm not even joking. Maybe it's different in the states...

In any case, it is rather sad what the world's coming to, but sometimes things just roll that way. I don't consider myself insulted if no one thanks me every ten seconds.