None of these are probably any good, but I'd like to run them through everyone else's head before consigning them to the future trash bin.
1. Katie Kaboom- A humanoid (yes I know, no humanoids) who, when agitated, spontaneously combusts/explodes. EDIT: forgot to mention, this means that she is essentially shredded, cranium completely missing.
2. Magic Pencil- Any 'magic trick' performed with the pencil will have physical consequences. When placed in the hands and moved so it looks like it's becoming shorter/longer, it will do so.
3. Train of Thought- An actual train that, when a person enters the conductor's seat, will show the layers of their thoughts.