One I used to say that got picked up by all my friends "Good Dom, have a cabbage." You say it when someone does something good, usually inserting their name instead of Dom. And you have to pat them on the head also. This came from a movie I was watching once, it was something about a kid, and it had muppets in it, and he had a dragon or something. I don't remember much about it. But he was complaining that you eat vegetables all the time, and get candy when you're good as a treat. He said it should be the other way around, and he demonstrated, patting himself on the head and saying "Good Dom, have a cabbage." (his name was Dom.)