Feel The Vibration

Someone's cell phone is on vibrate and it feels like it's somewhere near my office. I know it's not my phone, but it sounds like it's coming from my bag. Should I be concerned? It'll be like that scene in Ocean's 11 where this George Clooney slips a cellphone in Julia Roberts' coat and it starts to ring and her boyfriend is like, "Aren't you going to answer your phone?" and she's like, "I don't have a cellphone," and then it's in her coat?

Anyway, there it goes again. Seriously, I'm scared to look in my bag.