A Sudden Realization

I was sitting in class earlier this week (CS124), in which my professor was giving a demonstration on the lab due on Thursday. Every couple of minutes from the beginning of class, the beginning of the "Charge" song would play. After a while it got very irritating and I kept thinking to myself, "Why doesn't whoever that phone belong to put it on silent?!" It was very frustrating and I was just a little annoyed. Just now, I connected my newly acquired equipment for said class and guess what it did as soon as I plugged it in to my computer? It played the "Charge" intro. Then a couple minutes later, it played it again. This jogged my memory from Monday and I figured out what had been making the noise throughout lecture. No wonder my teacher didn't get mad--he knew where it was coming from! It all makes sense now. And there's my sudden realization for the day.