What is the most incredible thing(s) you've ever seen?

I know we've all probably witnessed some crazy stuff. Please share some of the craziest, most unbelievable, amazing, horrible, painful, crappiest,...

Source: http://forums.ufc.production.sparkart.net/showthread.php?t=120464&goto=newpost

Mirko Cro Cop Filipović Luiz Buscapé Firmino Spencer Fisher