A few years, I was in the flying school, one Saturday morning at about 8.30am. The Ops staff were busy & all the phones were ringing, so I answered one, just to help out.
Irate Lady: "I wish to complain about the noise from a low flying helicopter"
Me: "Please hang on a moment, while I check if it could be one of ours"
I check the movements board.
Me: "Well the only one of our helicopters that is likely to be in your area today, is one that is leaving here at 10.00am, to give pleasure flights at xxxxx Country Show, but at the moment, I can see that it is still on the ground here"
Irate Lady: "Yes that's the one. I have seen the posters for the show, so I am phoning up to complain, in advance"