i found this part of the part of the video because the character that he play (dean) would totally do that even in the supernatural video. Jensen is so awesome though and in tune with his character that he did this. He even put the topic of the episode in it by scratching his arm due to him having ghost fever in this episode. over all this part was epic and one of the greatest bloopers.

This is another great blooper. dean the character is never scared of anything in this entire show. to see him to be scared of everything is hilarious. his scream is just epic for his character but what he said after it just made it the freaking awesome.