Q: What happens if I Zap a Creeper attached to a Keeper? Or Zap a Keeper with a Creeper attached?

A: The Creeper and Keeper stay attached together until something separates them. So they would go to you, and attempt to go into your hand, which would separate them, since a Creeper cannot be held in your hand. So you’d end up with the Keeper in your hand, and the Creeper on the table in front of you, which will immediately attach to a Keeper, if possible (some can attach to any Keeper, some only to certain types.)