Danger theme? Oh my I have so many. For the theme that really stresses me out I would say-
http://www.youtube.com/watch?v=rf2A9NbOdZU
As for the music which makes me think of immediate terrifying danger I would say-
http://www.youtube.com/watch?v=69YakPKHMvs
And the final track, the danger of the worst kind, is the feeling of hopelessness and death. This track physically makes me feel really unpleasant, and yet I cannot stop listening to it-
http://www.youtube.com/watch?v=LLvVW0g3mxM
Edit: Woops for that last one I meant-
http://www.youtube.com/watch?v=Nlgh6Rh0mPk