wow, the exact same thing happened to me. but my friends came over and got interested, then my teacher yelled at me.
A couple of my friends came over toone of them clicked the video at high volume and we all heard a very loud "Pika!". XD Funnily enough, my teacher didn't really seem to care.
I did not really see it until I was in the library working on a project, when I turned it on, and I did not realize that it was at full volume. everyone in the library stared at me for at least a minute.