These aren't the druids your looking for.

[The Yosemite Bear]

Once apon a time in an AD&D game our party was wanted by the local authority for something our stupid thief (rogue) and the watch flaged the party for having two "Elf nature types" (an actual Druid, and a Ranger both were wood elves) the party psionic tried using dominate on the gate guards with the Above title line. So some best example of our inner geekyness infiltrating our games.

DM: You see a whole army of 4000 Orcs in the cavern below you.
Player: when was the last time we saved the party's progress?

The time we found an inn full of Goth kids who thought vampires were sooooo cooooool.... (paroding WOD in AD&D, though you could also include paroding Twilight in WOD....)

[Oskuro]

I almost smaked our DM around the head when a powerful Balor came up to the Tiefling in our party and uttered "I am your father". Instead I brought out my Vader helmet so he could properly deliver the lines.

[The Yosemite Bear]

Malkavian to Nosferatu elder: Will you teach me to be a Jedi?
(actually happened, though I was the one who had the movie fan Malk)

"You realize that if something happens only once every 500 years, we will happen to get there exactly 500 years after it happened the last time." -The party's fighter being incredably genre savvy.

[UCBooties]

My fiancé has been running a very, very unserious Evil Campaign where we all belong to an evil company called Evil Mark Enterprises. (Yes, the CEO is named Evil Mark) Our direct boss is a werewolf named Hector and during the course of a recent mission my half dragon Dwelf (long, long story) Mud got it into his head that we should get Hector a new couch. So we took one from Evil Mark’s office. Which led to this exchange with Hector:

Hector: You didn’t get this couch from the mine did you?

Mud: (shakes his head)

Hector: Where did you get the couch?

Mud: You promise you won’t be angry?

Hector: I promise, I will not be angry.

Mud: Eve somebody.

Hector: Eve somebody, (nodding) Eve who?

Mud: Eve LeMark.

Hector: You stole a couch from Evil Mark’s office?!

He then proceeded to strangle my character.

So we ad-libbed a scene from Young Frankenstein completely in character and with no prep. Very fun.

[SCRawl]

An AD&D campaign (first edition, the only kind there was at the time) saw my cleric intercede in an argument between the PC paladin and an NPC fighter types after several wasted minutes of otherwise useful game time.

Me: Enough of this, I cast my command spell.

DM: On who?

Me: The NPC.

DM: Okay, what's the command word?

Me: "Apologize"

NPC: ...And what I really want to do to you is [shakes head]...say I'm sorry...

Paladin: I accept.

It was one of those "you really had to be there" moments, but the entire party was in stitches.

[Serafina]

We once had an actual bunnyrabbit as an endboss.
Spoiler

Of course, that thing was actually a transformed dragon - with a spell that did NOT change any attributes and actually maintained the standard attacks - bunny-wingbuffet!

[Ritterin Sophia]

I'd actually be interested in what a bunny using tail smash looked like.

[Serafina]

I'd actually be interested in what a bunny using tail smash looked like.

"As it wiggles it's cute little tail into your nose. you feel a crushing pain slinging you five feet away".

Oh, and in case anyone wonders: The wing-buffet was done with the ears.

[Oskuro]

So, did your party have any Holy Hand Grenades?

[Serafina]

So, did your party have any Holy Hand Grenades?

What do you think that was? Some kind of Monthy Python parody?
For Petes sake, we were not even looking for some kind of cup - instead, we were after a Set of Holy Carpenter Tools to recraft the epic gates of some city.

[Oskuro]

In other words, you did not. I'm sorry for your loss

[Master of Cards]

in 13 weeks I have died 7 times

Mavis died from attacking someone eating his parrot.
Tavis died from not being able to move in his armor underwater.
Davis died from triple botching looking at a bed.
Yavis died from an old lady beating him from walking funny.
etc