This happened in my guild's 1st encounter in mana-tombs.
There were those little mana wyrms which detonate for 1-2k dmg upon death and they came in groups of 4-5.
My mage guildie went in an AOE the shit out of those wyrms and all of the wyrm detonated at the same time when everyone was standing close.

The next moment we can see our bodies lying on the floor

Talking about splattering on ground.
I was flying above Halaa and observing pvp action from above on my flying mount.
Then, i accidently clicked on my spellbar while moving my mouse.
"Stupidmount" addon auto-dismount me and i fell down right in the middle of the battle.
I took 5k fall dmg and i quickly NS heal up and earth shield myself.
Everyone start targetting me and i became a walking bait for some reason.
Thank god no one purge or spellsteal my earthshield. Ranaway and jumped into river. LOLOLOL