Z Games, home of the "Choose your own Adventure" monthly campaigns.
The "have your HQ charge your opponents HQ, hand your opponent something small and yell at the top of your lungs, 'You've been served!' It is up to your opponent to take your HQ's head or battle him". Mike jumped off the floor & instead of fighting my Avatar, Mike's GK HQ took his head.
It was EPIC!
Or the Tourney, game 3, where we had to swap armies with our opponent and poor Nik with the thousand plastic Orks had to play with my dainty pewter Eldar and I had to figure out how to move SO many models in a timely manner. It was AWESOME!
Who could forget: starting EVERY tourney with a healthy WAGGGGGGGGGG