Friend of mine was transporting a VHF communications antenna on top of his truck. About 12' long, white fiberglass, maybe 3" in diameter with 45 degree angle wires at one end. Someone called the state police and reported a person transporting a "missile". He knows this because the NY State Police pulled him over on I-87 to ask him what it was. He gave them the boring explanation, rather than having fun with it, and it was no problem. This was years ago.
They need to change the slogan from "See something, say something." to "See something, say something. We're keeping a list of idiots."