Cell phones in class

Here is a first-day stunt that did not work out so well: I set an alarm so my phone would ring in the middle of my lecture. I was talking about the syllabus and it rang, and I proceded to answer it and have a short conversation. I said that I thought everyone was looking at me and hung up, and then I stepped out of character and told the class to take calls outside and not disrupt class. Ten minutes later my phone "rang" again - I hit the snooze button instead of turning off the alarm. ;-)