Swiping noises on MacBookPro

Strange... I know... and no I'm not doing anything.

It happens randomly when I'm at the computer or away from it. I have no clue what program it is so I'm trying to find out what it might be. Any help would be appreciated? Again, its random so I can't begin to pinpoint the details. And no I'm not sitting in Launchpad and playing around. I just did an install of Mountain Lion from a bootable USB.

MacBookPro

15", early 2011

2Ghz Intel Core 17

Software OS X 10.8