The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at the Trope Launch Pad.
WarJay77
(Troper Knight)
2019-06-19 11:23:54
This happened in Ned's Declassified School Survival Guide as well.
Working on: Author Appeal | Sandbox | Troper Wall
Unsung
Since: Jun, 2016
SaraSanddollar
Since: Jun, 2019

Characters are trapped in a certain location, and the door does not unlock from the inside. Later in the story, more characters will show up, open the door, come inside, prompting the ones already there to shout, "DON'T CLOSE THE DOOR DON'T CLOSE THE DOOR DON'T-" only for the door to promptly shut and trap the newcomers inside as well. This repeats a few times, with more people becoming trapped. Occasionally, the characters inside will tell a story within a story to pass the time. Examples include the Passover episode of Rugrats and the musical episode of Con Man. Is there already a trope for this?