One of the less stranger things on the net, basically a tongue in cheek description of two opposing characters with actual calculations thrown into it anf followed with some good animation fights between sprites. (though by the one with best quality is the goku vs superman) Personally I like the batman vs spider-man or starscream vs my little pony (yes you read that!)
http://www.screwattack.com/shows/originals/death-battle (http://www.screwattack.com/shows/originals/death-battle)
No because there will always be a looser (unless it's a draw) and nobody likes seeing their favorite character getting beat up now do they? ;)