Was helicopter pleasure flying at a show "oop nawth" a couple of years ago, outside controlled airspace away from any NOTAMS and working local military unit.
Whilst on the ground during a turnaround was aware of somthing moving in my peripheral vision and turned my head expecting to see a bird. At that point ten bright red hawks (they had the spare with them) in two flights of five flew over the site at +/- 500' agl. Had i been airborne in my normal circuit, could have been a bit scary.
Freind of mine watching (also a pilot) observed "imagine how much trouble you would be in if you did that to them". I HAD filed a CANP notifying my activity!!!
Looked Bl@@dy impressive though!