We also somehow got onto the subject of supernatural and we have decided that Dean would be Iron man while Sam would be Batman. Dean has the whole ladies man thing going on and with the (scroll over for slight spoilers from Iron Man 2) Daddy issues and Self destructive tendencies brought up in Iron Man 2 it fits so well. Sam on the other hand is an angsty little guy who walks more on the dark side of things. This revelation brought us at leas an hour of hilarity.
( My thought on Iron Man 2 )