Leave it to 'Jackass' star Steve-O to close a show with a bang. At the end of Charlie Sheen's Comedy Central roast, Steve-O dove headlong into Mike Tyson's outstretched fist for reasons that probably only made sense to him.

After the self-inflicted blow, Steve-O stumbled around the stage in a daze while his eye began to swell and blood poured from his nose. Meanwhile, guests at the roast looked on in disbelief.

Sheen later posted a picture of Steve-O sporting a gruesome-looking black eye. "It's like a medical mugshot. You crazy bastard," he wrote. (Warning: The following video is NSFW due to language and general stupidity.)

[Comedy Central via Gawker]