Stephen Hawking and Pins and Needles

Alright, listen up, buttercup. This joke is funny because Stephen Hawking, that brainy dude, was super famous for being a genius scientist, but also for being in a wheelchair because he had ALS. So, telling him to "walk it off"? That's like telling a fish to climb a tree. It's impossible and kinda silly, which makes it a joke. You probably didn't know that ALS is Amyotrophic Lateral Sclerosis. Basically, your brain and spinal cord start acting like they're on strike, and your muscles get weaker and weaker. You probably think that is a new ice cream flavor.