LOL. Yeah I actually have a pretty fun way to teach it where I make kids lords, vassals and serfs (and I use Smurfs). Then I make them pledge loyalty to two lords... then have those two lords go to war. Its fun to watch them try to figure out which lord they should side with.

I just wanted an excuse to mention how bad feudalism is in practice. Some people think it might be a fine way to organize things today...