Guess Who?: BJ and Baby Bop decide to get Halloween celebrations underway with a costume party. But when it comes to picking costumes, Riff just can't decide! That night, as the festivities get underway, Riff makes a grand entrance proudly wearing a costume that suits him perfectly! Educational theme: Friendship. Sweet Treats: Barney and his friends go trick-or-treating in the park. One of Barney's friends discovers all his candy is gone...he has a hole in his bag! BJ shares his candy and everyone learns how nice it is to share with friends! Educational theme: Sharing. Music curriculum: An introduction to musical instruments (kazoo, drum and cymbals).