Well, worst would be last edition lizardmen. I had Ld10 bubble bunker slann in temple guard vs orges.
Ogres charge stegodon, rolls high for charge, gets extra impact hits, impact hits alone take out the stegodon.
Block 1 of saurus are flanked by mornefangs, take losses, still steadfast, coldblooded leader 10 with re-rolls thanks to BSB. Fail both, caught and killed, mornefangs overrun into next block of saurus engaging other ogres. Repeat of last block, failed ld10 twice, caught, killed, overrun into templeguard.
My turn! Slann casts Speed of Light with irrisistible, rolls 3 on table, rolls a 1 for cupped hands, kills almost all the temple guard and is sucked into the warp... If i remember right all i had left was the BSB and 4 templeguard so we called it.
Luckiest was recently with lizardmen again (dont seem to have these moments with my WoC army). This time, a block of saurus charged some vampire black knights, did some damage with only a couple casualties. Then they were flanked by a large block of skeletons. Somehow he managed i think 3 saurus kills and I inflicted so many casualties (my dice love predatory fighter it seems) his black knights vanished (along with the vampire) and a large chunk of the skeletons are gone as well and crumble takes out the rest.