Birds can break Airplane cockpit window glass.
Angry Birds can break iPad glass.
But the "Nick" is on the outside.
Maybe an Angry bird in your room wanted in.
LOL @ AngryBirds and break iPad 2 glass.. I think Im gonna accept this as the cause!
But ya I see the nick as well - but like Ive said, I could totally accept it if I dropped the iPad 2, or anything on it... but what boggles me, is the fact... this happened while I was using it.. holding it with both hands.. sitting on the couch. It's not like I went thru an earthquake and stuff went flying.