Despite being half Cypriot, I don't speak much Greek. Apologies to actual Greeks who realize how badly I'm butchering my transliterations here; my ancestors would be ashamed. (Most of them would probably just laugh at me though.)
That said, one of the funnier ones that used to go around in my family works like this: You yell for me from across the house. I respond "Di?" ("What?") And you yell again, usually meaning I should come over to wherever you are. Again, I say, "Di?" ("What?") And in exasperation, you respond, "Si kephali su tribidi!" (Your head is full of holes!) with emphasis on the last, matching, syllable as if to say "that's what!"