The Blood Moon Rises
A Half-dragon gnome sorcerer, human shotgun fist monk, and a human shadowmancer all stand in a bell tower during a full pale-red moon. After deciding they should ring the bell to alert the town that they are in the haunted courthouse.
Half-Dragon: I want to roll for knowledge on the moon.
DM: Really? You want to roll for the moon?
Half-Dragon: Yes. *Rolls a nat 20*
Party: *starts laughing*
DM: GODDAMNIT IT WAS SETTING THE SCENE. You know what fine. *Provides a link to the Eberron moons page.* It’s Aryth.
Half-Dragon: *Reads about Aryth the Gateway moon, whose affiliated sign is the Dragonmark of Passage.* Okay now lets ring that bell.
DM: Are you sure you want to ring it? Last chance to turn back.
Party: …
Half-Dragon: PULL THE LEVER! *she pulls the lever to ring the bell*
The bell starts ringing, as it rings the town becomes swathed in spectral blue flames, followed by the popping up of blue spirit children laughing, and cackling. While the moon now looks about five times closer.
DM: *Laughing manically*
Party: *Starts crying*
Half-Dragon: *Realizes implications of the GATEWAY moon* I fucked up.