DnD Players: What was the biggest "How the fuck did you pull that off" maneuver in your campaign?

During Lost Mines of Phandalver we've entered an orc cave and seen an ogre among them. Since we knew ogres aren't that intelligent and we all had some form of telepathy (no darkvision though), we've decided to convince him that he's a champion of Kelemvor (my paladin's god).

Our sorcerer cast prestidigitation to get their attention, and our fighter used her telepathy to tell the ogre "listen to the short guy in heavy armor that will come here in a minute",roll deception... Nat 20.

A fight with orcs later, I've explained the basics of my religion to the ogre and renamed him Shrek. Now he's running a church in Conyberry.

This was with the AD&D rule books in the mid-80s, so rules were simpler and it was more off-the-cuff.

I had a dwarf fighter in the party, and we were in a dungeon at the end of a corridor in front of a door. I explained to the DM I wanted to run at and jump into the door, bashing it open, do a roll, and land on my feet with my axes in my hands. He told me I'd be successful with a natural 18 on a D20, and I rolled a 20. He described it really well, embellishing with how the door splintered and all; it was fantastic.

The room, however, was completely empty, which turned it into an epic tale we'd refer to the rest of the time we gamed together.

I guess I can start.

We double crossed an incredibly powerful wizard in Out of the Abyss. DM did not expect it at all.

Full Spoilers for Out of the Abyss, which was by and large a not super great adventure, just because the whole first half of the plot was a survival sandbox and then the second half was really interesting but didn’t feel super fun to do a bunch of fetch quests.

Gnome barbarian tied himself to the mast of an airship and jumped off to fight a blue dragon.

He was outdone by the cleric jumping on it's snout and necrotic touch hugging its health down.

Capped by the rogue who saved themself from falling with an immovable rod and made a one handed shot with an enchanted blunderbuss for the kill shot as it was fleeing.

I was running Curse of Strahd, and my players managed to kill the Roc of Mt. Ghakis without even directly interacting with it.

This was actually on the heels of a major boss encounter where I ran a certain coven of hags as a (https://www.reddit.com/r/monsteraday/comments/90jss4/day_365_hag_covenbiest/)[covenbiest] out for revenge. When the party defeated them before, they decided they wanted to eat part of the hags as revenge, so they cut off some fingers, and each had one. I rolled some force damage (3d8) and on my (https://drive.google.com/file/d/0B7WbOcl0Q_ZvR21BcUZFMXlMSWc/view?usp=drivesdk&resourcekey=0-pCVKv7KV3DIEnS6sozkX1w)[d10,000 wild magic table] to determine what happened. Some laughes were had but nothing major. Cut to my party of 3 + an NPC half dead on the slopes of Mt. Ghakis, desperately trying to Tiny Hunt through a long rest in the blistering whiteout conditions of Mt. Ghakis with the covenbiest laying just outside, their and the party's blood everywhere. Happened to roll the Roc on the random encounter table and figured it'd be very interested in the scent of possible fresh carrion near its nest.

It landed. Immediately, I thought, "Well, its not stupid, it won't eat the vile-smelling unholy boss monster laying here" and said so. Party wanted to roll for it. I probably said something like "Ugh, fine," and that it probably wasn't hungry because there's only a 10% chance it had an unsuccessful hunt. We roll the d100, fuckin' 98. Fuck.

So I guesstimate how many d8s of damage to roll and the party run out and bum-rush the thing to make sure it's dead. Obviously the bird did not survive.

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I think the most epic was when I was DMing my party at 5th level. They were trying to free some Yuan-Ti slaves from a large complex with a pyramid in the middle. After selling two of their party into slavery to get someone on the inside they rallies the Vanara (monkey folk) to help with their prison break by defeating a Yuan-Ti patrol to prove their worth. So they had some scouts (CR 1/2) backups along sides some commoners in the complex. So they had a tough fight. There was a deadly fight at the main entrance, a hard guarding the slaves and another hard inside with a full dungeon worth of reinforcements inside the temple. So doable if they could be to kept apart.

Before they started their prison break they wanted a big entrance. So they stole a triceratops egg to get them as their distraction. So the barbarian is rushing towards the entrance with these beasts while the wizard and artificer teleported in the gate to give the hard and ranger (inside as slaves armed with daggers) their main weapons. They got inside to arm the party and few of their slaves. The dinosaur and barbarian in front of them hit the front gate causing chaos. At the same time the slaves with the rest of the party turned on the hard encounter of Yuan-Ti guarding them. During this time the bard cast major image of a dragon to draw some fire, while the blade singer and the artificer are killing the melee crew around the fleeing ex-slaves.

The barbarian is taking hits while running towards the party. The dinosaur made some good distractions if the front guards but the reinforcements were coming around to attack the party and the temple alarm was being raised. I figured they would turn tail and run because it was looking bad.

But then the spell that turned the tide was cast. The bard cast Plant Growth. The entire massive battlefield became 4x movement to get through. The reinforcements which were 1 turn away now became 4 turns away if they dashed every round. The bard made a path for the barbarian to catch up to the party while everyone enemy was either dashing to get nowhere fast or barely taking pot shots with their weak ranged. The tide flipped and the Yuan-Ti tried unsuccessfully to retreat back inside before the ranged attacks rained now.

The entire battle took like 20 rounds over 3 play sessions. It was an epic fight all around

Spelljammer campaign at level 11. We were hired to get a MacGuffin necklace off of a pirate, by his rival. We waltz into his stronghold, get an audience, and then Nat 20 a Persuasion check to convince him for a 1on1 with my bard, b/c for a pirate so tough, what threat could my bard pose? His guards and my party members leave the room.

Land a Suggestion to have him hand me the necklace, and then land a Modify Memory to have him think it was his idea: we would claim he was dead, use the necklace to get an audience with his rival to show her "proof," and then double cross her and kill her. Then he'd swoop in, reclaim the necklace, and pay us handsomely.

Poor dummy. Hoodwinked!