Basically, making a V shape with un-powered "Powered rails" then placing a bunch of TNT minecarts on one block of the rail then powering the rail will then cause a extremely loud noise that kind of sounds like a car engine. The minecarts with TNT in them will then start moving. As the minecarts get faster the more it sounds like a car. If your player stands in front of the moving minecarfts it will explode, launching you extremely high in the sky. My attackment is to large so I will upload it to youtube. ( http://www.youtube.com/watch?v=-mzKfKP9f7Q&feature=youtu.be )