I can get a little...overinvolved...in the action.
DON'T OPEN THE DOOR!!!!
YOU OPENED THE DOOR!!!!!
Reminds me of the last time I went to a haunted house, got scared and grabbed my friend's hand and ran all the way through and out of the maze - only to find that I'd grabbed the hand of one of the performers and drug him all the way outside.
This is definitely why I don't watch scary movies.