So, should I come out of the closet yet?

Listen to the Squirl with the big hair.

When he goes out next, go into his room and start taking things. Small things, of course, but things that he might need (i.e. calculator, pencils, books, tv remote, etc.)

Also, try to rig it so you can control his stuff from your room like A.S. suggested. Major laughs...
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"I reject your reality and substitute my own." ~ Adam Savage; Insanity Personified
"Crikey!" ~ Steve Irwin (R.I.P.); Perfection Personified