We had this British lady as our lecturer for criminology today, and she was a "positive" Nazi, (ie. I didn't feel threatened by her). People were talking and she would stop and stare, and then she would say "Have you FINISHED? ... GOOD!" and then one guy was texting on his phone and she stopped, stared at him and said "i hope you're taking down lecture notes on that mobile phone.. are you?" and she forced a "yes" out of him, which was obviously a lie...
Quite a contrast from another lecturer who the previous Friday had said "Come in and do what you want, if you want to talk, i would prefer if you go out side and do it over coffee, but either way i don't care. I just come here and say what i want and it doesn't really bother me whether anyone is listening".
Another lecturer last semester would stop talking and do a funny dance every time someone’s phone went off, which would cause embarrassment to the person because everyone laughed.