Went on a tour of an airport (small international one). Security told us they get weird scares all the time. A guy had a paperweight novelty grenade in his bag. Crazy part was they knew him-he worked there for 30 years and had recently retired. Dude missed his flight and had to answer looooots of questions. FBI didn't clear him for travel until a month later. They said it wasn't a prank either, guy just didn't think anything of it.