I was "girl who borrowed her bf's stopwatch without realising that it beeped on the hour"! I put it at the bottom of my bag to try and muffle it (which meant that I had no time other than the clock), but a couple of times the proctors heard it and were looking around, trying to figure out who it was! After break they made an announcement reminding everyone not to use timers with sound, because it would be bad for them if they got caught!