49. Put him in a Mocha costume. (cute little kitty!)
50. Mess up his science notes so when he reads them, then uses his memory of said messed up notes on his test, he gets all the wrong answers and gets an F-
57. When he opens his Christmas presents, tell him there was a mix-up and they're not his, then give him Chamametchi's pesents and tell him THOSE are his.
58. Show him this topic.
59. Tell him Mimitchi got a better test score than him.