Well, here's a couple...
Playing BD&D, I was a first level thief, scouting ahead of the party. I failed my 'Find Traps' roll rather badly, and found myself caught by the classic rope snare - the kind that leave you dangling upside down in midair. And I heard voices - bugbears, who had probably set the trap.
Rather than cut myself free, I twisted myself up to where I could grab the rope and climb it - I intended to get free and then hide in the branches, or move from tree to tree. As I balanced carefully on the branch, I could see the bugbears below me, and I pulled out my dagger.
I couldn't tell what they were saying, but I imagine it was on the order of 'What the heck, we heard the trap go off, it was right here, where is the guy?' And one of them started to look up.
I jumped from the tree, as far out as I could, letting the rope stop me and swing me back in an arc, my dagger held out in front of me with both hands.
Natural 20.
The other bugbear sees a screaming human swing from the tree and plant a dagger in his friend's chest (dropping him). Out of sheer surprise, he misses his own blow, and I'm able to climb back up the rope and hold him off until the rest of the party arrives.
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Another one, that I was not actually present for. The characters had to find a way to deal with some sort of alien biomechanical spacecraft that was (if I recall) implanting people with 'seeds' and controlling them. Their plan: they'll make a diversionary attack, and one of their number will sneak into the spacecraft, plant a large explosive device, and sneak back out, when he'll call the guy with the detonator and tell him to set off the bomb. Spaceship goes boom, world is saved.
So the character sneaks inside the living ship with the bomb. The outside attack is going well, the ship has no idea he's there. He gets to the central 'brain chamber' though, and things change. Huge tentacles form from the walls to snare him (and the bomb). He struggles, but they're too strong for him.
So he turns on his communicator and says, "It's planted. Do it."
* * * * *
There's some great ones coming up in my Freeport Story Hour, but I don't want to spoil anything, so you'll just have to wait for those...
J