In the "stranger than fiction" category, see this article at the BBC.
[The artist] taped bunches of carrots together with black tape and attached blue and red wires and a clock to them.
The carrot bombs had been placed around the city at the request of a local art gallery, as part of an open-air arts festival.
People apparently just saw sticks of things taped together ominously, and called the cops, who considered the bombs too realistic (presumably from a distance). So now I'm imagining putting up a sign next to them that says "Not a real bomb." Strangely, I think people would find that more worrisome.