A fun app called, bWatchDoggy, is an application that uses Storm’s accelerometer to use as security or to have fun with your friends.
To catch your friend, or someone else, touching your phone, all you have to do is: Launch the app, leave your phone on your desk, wait 3 seconds for the app to activate, and when someone picks up your phone a loud dog barking sound is played.

Run your finger on the phone's screen toward the right, and this will stop the barking. Make sure you set the application to "allow" under permission in order for it to work correctly.

via: bWatchDoggy - Entertainment Blackberry Apps