I'm not sure what my worst 40k moment is but I sure know what my friends is...
We play most weekend and he had never beaten my SW with his CM. One day he decided to try out Abadon.
Having never seen what a Abadon could do I can say I pretty much got my arse handed to me by Abodon who single handedly ripped though my army.
The only thing I had left on the board was a Wolf Guard in power armour, the soul survivor of a Grey Hunter pack and a Drop Pod.
All he had left was weakened Abadon (1 wound remaining). Regardless, he was winning, well ahead on KP's, it was his turn 5 and he wanted pay back!
He decide that my lone wolf guard was out of assault range this turn, so he would assault the Drop Pod. Auto hitting a DP wan't too much of a task for a WS7 Abadon. He raised the deamon sword Drach'nyen above his head and......... (Now, for those that don't know, when wheedling a deamon wpn you roll a D6 and the resulting number is the amount of extra attacks you gain. However, if you roll a 1, you take a wound with no save.).........rolled a 1.
Remember, annihilation is always a victory condition!