There's a TV trope called Locked in a Room, in which two or more characters who don't like each are trapped together for what appears (at least to them) to be an indefinite but lengthy amount of time. As such, conflict arises and the characters are forced to come to grips with their animosity. The more general use of this is the Bottle Episode.
Write a story in which five characters who already know each other (and possibly hate each other) are trapped in the same room.
Why is this story so much more difficult to write than it is to tape? Mostly because you're going to have to do a lot of dialogue choreography to make this story about more than just the description of wherever you've trapped them. Also, you've got 5 characters - making sure the reader understands whose talking when and keeping the plot moving along is going to be a pain. Since there's no movement, the plot will be basically completely emotionally driven. For writers who focus more on action, this prompt will be a challenge.