Strange things happening

About a month ago, I took the kids to the Seacoast Science Center in New Hampshire. The center and its contents, and the art auction that was going on as a benefit, could all be the subject of a post if I ever wrote posts, but I did want to mention the sign I noticed outside that said something like

Unusual activity has been noticed in the park. [The center is part of Odiorne Point State Park.] Please report anything suspicious to park employees.

I asked them whether "unusual activity" referred to bears or UFOS, and they told me it meant flashers and paedophiles. I suppose they didn't want to put that on the sign, but perhaps they were a little too discreet.