Oh, man. There were so many.
Like the time my Wookiee Marauder leapt into combat with a really big, bad dude and was tearing him up with vibroaxes. But his Klatooinian Heavy best friend decided that he needed to also fire into that combat against the guy, and I told him “Go for it, even if you roll a Despair, I can take it.” The player of the Klatooinian proceeded to roll enough Success and massive amounts of damage, but no Advantage – plus a Despair. So, my Wookiee had to tank it all. It damn near killed him, and it was the most damage he ever took in combat – before or since.
Or the time that my Besalisk Heavy/Sharpshooter/Ace Gunner was using a heavily customized crafted Heavy Blaster Rifle against Swamp Dragons (slightly smaller than Krayt Dragons, but not by much), and I kept rolling massive amounts of damage and Advantage, so I kept one-shotting them with auto-fire. They never hit my character once in that combat. Just about everyone else almost completely died, but it was their stupid idea to go dragon hunting in the first place, and they weren’t bright enough to turn around and get out of there as soon as they saw a family group of four or five of the things in the swamp.
Or the time my Pantoran Jedi Padawan was deep in the middle of a pitched battle with his Clone Wars era comrades all around him, and we were surrounded by Dwarf Spider Droids, Crab Droids, Octupurras, and every other kind of heavy droid the GM could throw at us, plus multiple phalanxes of B1 and B2 battle droids.
I think we were all supposed to die in that battle, but at the last moment I managed to roll maximum white force pips on three force dice, and so had enough to not only grab and toss the DSDs to Extreme Range and let falling damage take care of them, I could also grab the Crab Droids, the Octupurras, and all the other heavy droids and tossed them all up to Extreme range. That left only the Phalanxes that the other characters had to contend with, and the battle suddenly became rather anti-climatic at that point. Of course, there was another battle with another group of characters that happened right after that one, and nothing that had been done in the previous battle really had any impact on that next one.
In the final battle of that same campaign, that same Padawan was in hand-to-hand combat with one of the strongest Darth Maul clone-alikes that I’ve ever seen, and it was a whole group of five masters, knights, and padawans that were all going up against this one big super bad guy – right smack dab in the middle of a huge dark side Vergence in the Force. For some reason, the bad guy decided that my character was the biggest threat, so when he was using Misdirect against the group, mine was the only character that couldn’t be covered by the illusions – he had a twisted sense of justice that made him need to fight “honorably” against his greatest opponent. And no, none of us had Seek, because the GMs had convinced us earlier that we couldn’t use the power in a way that we had wanted to at the time, so everyone thought the power was useless and no one ever invested any XP in it. Even if we had, we wouldn’t have been able to use that power to help anyone else, and we couldn’t have done any other combat in that round if we had used the Seek power to see through the illusions.
Anyway, the illusions were carefully crafted to completely take everyone out of combat that was affected – they thought they were hitting and hurting him, but they weren’t. It took me a while, but I figured out that I was somehow the only one in the group who could actually see and hurt him, but he kept us from being able to communicate with each other, and so the only thing I could end up doing that was effective was to use Draw Closer to pull him in and slash him for lightsaber damage, then use as much Force points as I could to increase that damage as much as I could (dark side or otherwise), and just keep trading lightsaber blows with him. Only he was using a double-bladed lightsaber, and he was much better with the lightsaber than my character was. I just kept getting really lucky rolls, including crits like Overpowered, which chained into another hit and another crit, and… He damn near killed us all, but we did finally end up defeating him. And my former Lightside Paragon dropped over 50 points of morality in just that one combat – not below 31, but close.