WWW - is that really how students behave these days?
Why doesn't the school have a code of practice stating:
1. Students will conform to a (stated) uniform policy. Spell it out if necessary.
2. Food and beverages will not be permitted in lecture rooms or briefing rooms. And no, there is NO NEED for bloody bottled water in an hour's lecture either!
3. The use of mobile phones is prohibited during lectures and briefings.
And tell the little scrotes that anyone who doesn't stop talking and pay attention when the lecturer enters will be assumed to be volunteering for a tech quiz. Or to decode the current TAF and METAR.