Hawking's Ambulation

Alright, listen up, chucklehead. The "joke" here is that Stephen Hawking, bless his genius brain, was famously unable to walk due to ALS. So, the dude starts off wishing he could walk, then remembers, 'Oh yeah, can't happen.' It's dark humor, see? You probably trip over your own feet just walking to the fridge, so this probably flew way over your head.