My favorite 40k moment eh? Probably when I was doing a miniatures game and was going against necrons. The Necron lord had wiped out my company command squad except for the officer. He passed his leadership score with 1 wound remaining. For another 4 rounds he stood against the Necron lord and killed him 3 times without taking another wound. My Imperial guard won against necron because he focused on trying to kill my commander. Dude just kept rolling ones.