Showing my heart rate while playing a scary game: Slender Game

 Yesterday, I've done this video:

Watch fullscreen

It shows me and my heart rate while playing Slender (www.slendergame.com).
With arduino, pulsesensor.com and some scripting I was able to monitor my heart rate.

Normally when I'm calm, my heart rate is around 50 BPM.
If you want to watch the most funny part of the video, go to minute 14 and watch how the BPM changes.

It's not hard to reproduce something like that.