I have another one. Again, from player perspective, because I apparently am great at ruining the best laid plans.
My first ever RL TT was Everway (which I still have a fondness for and wish the tarot deck in my own copy was complete). When I made my character, I'd been in the middle of the Riftwar (Raymond E Feist) books. I decided I wanted a 'bag of holding'-ish like Nakor had. The ST allowed it because wtfever, right?
Well, I collected everything. And I kept a running list of it. One of the things I collected was vials of sakura petals left behind by a goddess who would show up from time to time (usually to send us on quests).
The first time I did this, I got a 'wtf why' face from the ST. He had no idea why I would even care to do so, but he allowed it. On the list it went.
Fast forward months. We met every week and about eight months down the line, we're finishing up a quest line through Hell. We reach the exit portal when a massive demon gets in our way.
I'm up first in initiative.
I look over my list of "stuff in the sack" and there it is. This stack of vials of pure deific essence.
I throw them all at the demon.
The ST's eyes go wide as the implications sink in.
The demon was not killed, but it was hurt/stalled long enough for us all to get through the portal without having to fight.
He was a bit more... careful about what he let me collect after that.