Back in the early 80s I travelled to work on my motor bike from Taunton to Glastonbury. On a good number of occasions I use to get 'buzzed' from a military helicopter very very low passing overhead. I'm sure they were doing this for fun in the early morning.
Eventually when I heard the helicopter above and behind me I gave a two finger salute and on occasions I got one back from the left side of cockpit. I'm sure they must have discussed at the pre flight briefing about winding me up.
Daz