How do people who are really smart (i.e. geeks) with some time on their hands entertain themselves?  Why, they build a do-it-yourself electro-magnet rocket launcher using something called induction coils.  If you care you can read about it here, but take my word for it that they get a lot of bang out of this gizmo.  Don’t believe me? Watch the Youtube video below of them launching an egg.  Keep watching until the end to see how the inside of the egg ends up: