In season three, there is an episode where Joey finds out he gets a part in a play. Everyone is sitting in Monica's apartment talking a Joey comes in. He circles around the kitchen table spinning around. While he's dancing, he's singing, "oh mommy, oh daddy, I am a big ol' baddy," or something like that. Well, one of the times he turns around all you can see is a big grin on his face but his mouth isn't moving at all and he's supposedly still singing.