Quote from Hal in Goodbye Kitty
Lois: Malcolm, Reese, get a move on! What on earth are you doing? Malcolm: I have to practice being in a wheelchair. Lois: Oh... Hal: I suppose that makes sense. You never know. All it takes is one horrible accident, and you end up in one of those for the rest of your life. Malcolm: It's just for basketball. Hal: That's the spirit.