AI - one reason to listen in to airband frequencies whilst 'away' from work is to keep an ear on students on cross-country flights, for example.
But it can be fun 'listening in' to studes. We used to have an approved RT scanner in the office at work and I heard 2 students being told to 'hold off' clear of the aerodrome as the circuit was too busy. Now, both were returning from GH and aeros trips, both were quite spirited characters and both were 'holding' more or less at the same place. Another mate and I looked at eachother and I said "What do you think they'll be up to?". "Dog fighting, perhaps?", he replied. So when they landed we just said "OK - who started it?" - and they fell for it. "It wasn't my fault, he turned towards me and I had to get out of the way" said one...."I suddenly saw another aircraft near me and took avoiding action" said the other. Talk about digging themselves a hole......!! Unfortunately they'd been seen by the visiting trappers who had no choice but to comment (albeit with 'knowing expressions') - and the misery of a Boss wanted to throw them out. We said that they were both very good pilots and had the right streak of tempered aggresion for military aviators - and if he threw them out then he could throw us out as well please. He didn't much like that and asked how we would punish them. Easy - make them sweat for a couple of days, give them a rollicking and then forget it. Which he did!
So now and again I still keep an ear on students who I've authorised....on an approved radio installation, of course!