Inspired by http://xkcd.com/1363/
Click the upside-down android to start, click the right-side-up android to stop.
If it stops working when you kill the app, just click the notification - it should run in the background.
I made this in, like, just short of an hour and a bunch of tweaking. If this is taken "seriously" (lol) - I'll add more features and junk. Like a choice of other screams and butt integration and moar.