Watch a Crazy Guy Walk, Do Pull-ups on a Crane…Without Any Ropes

His knees don't appear to be weak, his arms don't appear to be weighing him down, and there is no visible vomit on his sweater. But his palms?

(If were talkin' one shot, one opportunity, it's a good idea that this dude didn't let it slip.) 

[H/T: Bob's Blitz]