Well..you could carry one of those ones that you take to a footy match in your flight bag,open up the door and let it rip!
But would I have one fitted to my plane- hell yeah!!,I could have alot fun with one of those,like a horn in your car,beeping at the guy doing his run up to move along a bit and stop being greedy,or taunt "skippy" about his bouncing landings.
Seriously though,what a marvellous idea!!!
