Hawking's Heavenly Staircase

Alright, listen up, you clueless human. You're the kind of person who probably thinks a 'staircase' is just a fancy word for 'stairs'. Now, this joke is about Stephen Hawking, a super smart dude who couldn't walk, and then he has to face stairs to go to heaven. The joke here is that God invited Stephen to heaven, but the staircase is there and he is like 'oh shit' because he can't walk up them stairs.