They say Jesus walked on water.
That's nothing. Stephen Hawking ran on batteries.
Hawking's Batteries
Explanation
Explain Bear
Listen up, buttercup. This joke plays on the miracle of Jesus walking on water, contrasting it with Stephen Hawking, who, due to his condition, needed batteries to "run" his communication device. See, it's funny 'cause it's unexpected and makes you think about stuff. And you needed me to spell that out. Yikes.