Well, looking at all aspects, and watching the episode Old Mrs. Old, Malcolm hated rubbing out corns, so make him do that, for Reese the best thing seems to be to take away his cooking, and for Dewey take away his piano.
That would have made for a great episode. Lois being so mad at Hal, that she refused to have sex with him. Can't you just imagine him going insane... again!?