Well, my characters tend more toward comedic moments than heroic ones, for some reason, but one was a ranger type in a group that had managed to get suckered into a trap by a shape shifting dragon.
So they'd followed a halfling into a cave, only to find themselves trapped in the cave with a very angry dragon blocking the only exit. There was much running and shouting and generally useless actions, with the group's one fighter trying vainly to get in a good shot with his sword. A distraction was clearly called for, so the ranger used some rope he had to create a lasso, and neatly settled it over the dragon's neck.
Said ranger was not going to be able to hold the dragon's head down, but the distraction allowed the now blessed fighter to land a critical hit to the dragon's underbelly as it reared up, and the fight was over.
In another genre, I was playing a bureaucrat at a top secret research facility that had been taken over by spies. The facility dealt with mind transference, and everyone inside quickly found themselves inhabiting the bodies of monkeys and rats.
Many escapes and escapades later, my character is the first to be returned to his own body, and has to hold off the spies at the door while the others switch back. He has a pistol, but can't bring himself to shoot through the door (do you know the paperwork filed to replace a door!?), so instead he uses the best skill he has, intimidation, throws open the door and treats the spies to a long tirade on how dare they take over his facility, etc.
Nearly no hope of it succeeding, of course, but then I roll two critical successes in a row. The GM had little choice but to rule that I'd completely intimidated the spies.
Still mostly comedic, but also heroic in its own way.