Tinky Winky, Dipsy, Laa-Laa and Po have a nice day of dancing. All the Teletubbies hear a curious sound coming from the Voice Trumpet and wonder What's that? Then they try to figure out just what color Tubby Custard is! The Teletubbies swap their favorite things. Uh-oh! It's a day to dance and play with the Teletubbies!