Pff that's nothing! Last session we used a hydra as an improved weapon
But seriously, that sounds like a cool fight - congrats on that clutch stun!
Technically we really did use a hydra - our transmutation wizard - as an improvised weapon. We had a party fight (very cheerfully. I wanted a new character, other player would take the winning character). The wizard got bored and volunteered himself as ammo. We had obscenely high strength scores, plenty to pick up a 2,000 pound "object" and throw it for 13d6+str.
My frenzied berserker probably should have had the fight, with his deathless rage and "wrathful heal" weapon enchantment (receive half of all damage done as healing, completely insane), but the raging barbarian pulled out a magic carpet and an eversmoking bottle and flew around to outlast the frenzy. He did use a climb check and "corner perch" first though, which was pretty cool to visualize.
I think he really bends the rules of rage actions, but it's all good! I'm glad he won, my character (a former NPC turned emergency backup character) had 5 int was kinda one dimensional.
Later in the session I switched to my backup character, a silly twin brother of my old bard character. The one who lasted thirty minutes before dying and getting reincarnated as a tarasque... Well, turns out I had never finished the character sheet. It was still great fun though! Instead of playing a dumb ogre I was a foppish bard (counterpoint to his skilled, world-wise brother). I helped the wizard escaped jail, learned that even bards really need to retrieve their possessions from jail because holy cow material components for *everything*, and even survived a couple of encounters! Got knocked unconscious though.
Then the party realized that the incoming liches were scrying my bard to find us at sea. As the character was a complete joke, and the real party members were pretty solidly evil, they turned my character to stone and pushed him into the ocean XD
So I lost two characters in the session, sorta, and had so much fun. Technically 3 - through complicated shenanigans, a mindless zombie version of my Ogre Mage Druid was present. My frenzied berserker beat him into a pulp out of frustration (regaining health) then used him as ammo as well. It was amazingly cathartic.