yes. the churrascaria is the awesome. the one I've been to up in SF has a little two-sided disk on the table in a little holder. one side is green and the other is red. if the green side is up they'll keep stopping by to give you meat. if the red side is up they don't bother you. it's a wonderful system.
back in the 90's the green/red disk didn't exist and the waiters would run around like crazy. it was fun when they tripped.