The most serious dude is the main character from
Riki-Oh: The Story of Ricky (China, 1991). They say prison showers are dangerous? Yeah, if you're in a prison shower and you piss Riki-Oh off.
*Warning: This clip is hardcore*
http://www.youtube.com/watch?v=U7Oat4B1qjE
Damn, this movie was ridiculous. I had to watch it a second time to make sure that the first time wasn't really just some fucked up dream I had.