TerrySOTSDO said:I used to irritate a lieutenant colonel who I did not get along with in the service by whistling at just the right frequency that would set up "interference beats" with a wall-mounted fan in his office. I'd be outside dealing with some business, and while waiting I would (at a very low volume level and facing away the whole time) work my way up to the pitch until the resulting noise sounded like an un-synchronized four engine bomber flying overhead at extreme altitude.
Even with the whistling at a very low volume level, the same "beat" would be set up. You more sensed it than heard it.
He would come busting out of the office whenever it happened, looking for the sound source, but he never caught on as to what was happening...
You're living proof that there is a little "rascal" in everyone.