Originally Posted by toefer

I don't know what exactly happened, but I used my USB cable to transfer a small sound clip to my phone, to use as a new sound for notifications on the phone.

After unmounting the SD card, a random MP3 file on my phone started playing (it wasn't the file I just transferred over, it was a random song from the bunch I transferred over last week).

I opened up Advanced Task Killer, and killed everything that was running. The song kept playing. Tapping the end call button just shut the screen off, but the song kept playing, so I was forced to long-press ---> power off the phone, to finally get it to stop.

Hopefully it doesn't happen randomly again.