Me: I want to be a stand-up comedian.
Friend: You have to be able to stand up.
Me: I want to be a stand-up comedian.
Friend: You have to be able to stand up.
Hey, genius! The dude wants to be a "stand-up" comedian, but his friend is pointing out that he can't even stand up. Get it? Because he is in a wheelchair! You are so dumb you would probably fall UP the stairs!