If you find out, please let me know.
Here are my favorite situations:
1. Gunners who join, then vanish at some point during the flight. So, a moronic con crawls slowly up your 6 and you are thinking "OOooooh easy kill" until, well, you guessed it, your guns never take a shot since the imbecile that joined is no where to be found.
2. Gunners who just can't hit the broad side of a barn. Pretty self explanatory...
3. Chatter boxes. Unemployed comdians who think they need to be the life of the party. Usually identified by comments like "What movie are they playing on this flight?" and such. While they are commentating on their life, the airplane and such, 20 cons are creeping at you.
4. Stealth gunners. They claim they are there, but no one, not even you, can detect them. On occasion your guns move on their own, so you assume they are there. But are they? Not a fun way to fly a long bomber sortie.
Don't get me wrong, I have had a few guys man my Lanc guns for me and they have really dealt some serious death and destruction. But, I largely gun my own and I'd sure like to find out how to light the "No Vacancy" light so these idiots to not attempt to pop in while I am in the crosshairs, planting eggs on the HQ.