that happened to me onetime i was in my yard(I used to live in the last hous on a private road in the country) and i was digging up the sod for where i was gonna put my veggie garden. next thing i know i didnt even hear it cu it must have been flying really low this black copter just pops up over some trees like 200 ft. away at most. I just stopped what i was doing smiled and waved at them. then just stared at them like wtf ate you guys doing. then they left. saw a state chopper do the same thing except they didt stop as long and they were further away.