1. Drink his blood paint. Sounds like something EJ or I would do XD

2. Burn am his paintings. Or don't. It'll make him really upset.

3. Ask him to draw a picture of you naked, like in the movie Titanic.

4. Put a flying cockroach on his mask. He's terrified of those hell spawns.

5. Paint him a picture. He'll be happy by the kind gesture.