When I was with the newspaper back in 1989-1990 we got a call in the newsroom from a guy who had found one.
He had no clue what it was, and no one else did (apparently they're fairly uncommon in that area of Pennsylvania).
I did some research in the local library and determined it was a Cicada Killer. Never seen anything like it before, and it made for an interesting article.
I've seen them a few times here in Virginia. Damned creepy.