This Old Thing?

People, for god's sake. While it's totally your own business if you like to build and detonate pipe bombs for fun, it becomes the business of HOMELAND SECURITY! if you accidentally leave one in your luggage and then try to get a on plane, particularly if said pipe bomb can be detonated via cell phone. And man are you going to be kicking yourself during those 10 year you'll be spending in prison. Plus, I seriously doubt they'll let you teach a Pipe Bomb Making crafts class there.