I had a professor that told us on the first day that if our cell phone ever went off in his lecture that he WOULD answer it. We all laughed, and thought he was joking.
Until a few weeks or so later.
Guy in the 2nd row's phone goes off, the professor, without missing a beat strides back there, and yanks it out of his hand. He barely can say a word before the professor is like "Hi... *look at phone* Sarah, I hope you're not Jim's girlfriend, since he's really stupid. He left his phone on in class and is probably gonna fail if he doesn't pay better attention to the lectures. You should try him again in about an hour so you're disrupting someone else's class. Have a nice day!" and he tosses it back to the guy, who kind of slowly mutters "that was my girlfriend", and the whole class loses it for a brief second before the professor started lecturing again.
Until a few weeks or so later.
Guy in the 2nd row's phone goes off, the professor, without missing a beat strides back there, and yanks it out of his hand. He barely can say a word before the professor is like "Hi... *look at phone* Sarah, I hope you're not Jim's girlfriend, since he's really stupid. He left his phone on in class and is probably gonna fail if he doesn't pay better attention to the lectures. You should try him again in about an hour so you're disrupting someone else's class. Have a nice day!" and he tosses it back to the guy, who kind of slowly mutters "that was my girlfriend", and the whole class loses it for a brief second before the professor started lecturing again.