Ceridwen's eyes dance, and she smiles. "That does indeed sound like fun," she says. "are you just going to change them physically or mentally as well?"
"Huh?" you ask. "What do you mean?"
"One of your guests is dressed as say, that character Spider-Man. Will he have just the powers or will he actually think that he is-what's the name again? Peter Potter? Packer? Or suppose another is dressed as a gorilla. Will he still know he's human and be able to talk, or will he actually think he's a gorilla? And if he knows, will he be compelled to act like a gorilla?"
You scratch your head. This is a doozy to think of.