I remember my twin bonesword warrior brood wading through a pile of CC Blood Angel Terminators... ah, happy days.
I also used lots of Stealers from Space Hulk and ALL its add ons... leading to many happy moments, one of which was my stealers taking out the tracks on a land raider (becomes immobile, extra D6 armour pen) which then gave it enough ap dice to rip through the hull.. haha, never saw a land raider again.
Or the time Bjorn the Fell Handed got jumped by a pack of stealers who ripped off his leg, then because I was vindictive (and the Wolf player was far too confident of his dice pool) I ripped off every other limb before finally attacking the body. OMG WINNOR.
One of my not so great moments was losing an Ichar IV campaign battle to ONE model. Commissar Yarrick and his damned "I can't die" special rolls... just him still standing in a SEA of genestealers, spore mines, warriors, you name it. We lost because of that one model, but what a freakin great visual image it was.