What Actually Happens When a Tranquilizer Dart Hits You?

Tranquilizer darts are quite useful in that they allow us to sedate large and/or wild animals without getting dangerously close to them. They are also very handy in movies when needed. But they don't really work the way you see in film. Here's the real story about tranquilizer darts, which actually do hit humans from time to time. (via Digg)