The Creepy Sound in Ipad!

This is true for some reason. At Tuesday, March 12 2013, I was playing Adventurecraft on the PC. While I doing the pistons project for the wardrobe, some sort of a soundtrack that I can hear is strange. At 8:19, I'm trying to play Draw Something while my sister was watching, The Pacifire on Disney. Is so strange, last time I never delete my 9 friends. But now all deleted, only left was "LetGoGo". Then I still hear another strange noise, but now is a squick. It's more like somebody use a swing in a playground. I about to flip out, then I close the Draw Something game. So at 8:21 I made this story. But I'm still scared.