Why do people in a wheelchair make bad jokes? Because they are bad at stand-up.
Physical Ability Jokes
A man and a cow are stuck on train tracks, and there is a train in the distance about to hit both of them. A vegan sees this and tries to help. Who does he save, the man or the cow?
Neither. He isn't strong enough to lift either of them.
If Stephen Hawking had a FIFA card, he would have 99 dribbling.