Hawking on a Roof

Listen up, buttercup. So, the joke is funny because it starts with the dude seeing Stephen Hawking, who's, like, super famous for being smart but also stuck in a wheelchair, chilling on a roof. But then, BAM! He falls off. It's funny 'cause it's unexpected and kinda dark, because, well, falling off a roof ain't usually a laughing matter, especially for someone who can't exactly catch themselves. You probably didn't know, but Hawking had amyotrophic lateral sclerosis (ALS), meaning he couldn't move a lot of his body. Get it now, genius?