Heroin screws you up.
Check out the soundtrack on this old public information film. There's another one with with a different actor but same music out there somewhere, but I couldn't find it..
http://www.youtube.com/watch?v=Kc4RyqXbonk
http://www.youtube.com/watch?v=Kc4RyqXbonk
It's my heart. It feels like an alligator.