Right, so I installed Pandora, and ran it in the background. After I was done using it (about five minutes), I went into the multi tasking menu, and shut it down. I then pressed the power button to turn the screen off, and after there regular screen closing sound, it started going "boing, boing, boing" about eight times. Then a different "boing" sound when I pressed the home button, and then proceeded to slide the button to unlock. Only way I was able to get rid of it was to turn the phone off and then back on. I tried to reproduce it again, but couldn't get it to make those sounds anymore. Has anyone else experienced this?