Our party was fighting some Azers and Fire Giants that were invading a town. One of the members of the party was facing an Azer, and right behind him was a Fire Giant. The Fire Giant swung at our ally, and missed him, because he had cover from the Azer. So the DM checked to see if he his the cover, and he did. So basically the Azer took some hefty damage from him Fire Giant comrad, and died. I asked (because I am mean), "Does the Fire Giant have Cleave by chance?" to which the DM replied, "Actually, he has Great Cleave." So the Fire Giant took his Great Cleave attack and ended up killing our party member. It is a great scene if you can picture it. The Fire Gaint, wading through his own allies, to kill one of ours. Sort of reminds me of the cave troll scene in LotR...