Who goes to theaters these days?
Anyway, I happened to recall "Dirk the Daring" from the (very) early video game "Dragon's Lair".
For some reason I started wondering: How the heck does he get out of there afterwards? All those bridges and walkways collapsed behind him....
Then I thought that might make for an interesting game.
You've killed the final boss, recovered the legendary amulet, whatever. Now you have to get out of the dungeon. Sure, you've killed all (or almost all) of the monsters, you've got the best armor and weapons you can carry, and you've even mapped the route. But - scavengers will have come out to feed on the corpses of the monsters you killed, all the healing potions / medkits have been found and used, and all the traps are still there......