Ah, the old "way that looks like an escape route, but in reality is a dead end". If you've never used this in a game...
What are you doing??
Transcript
[SFX]: Snap! {Rancor snaps bone in its mouth}
Luke: I look for an escape route.
GM: You spy a passageway—
Luke: I run in!
GM: —but the gate at the far end is closed.
Luke: Oh, great.
Leia: Is there a gate at the monster end?
GM: Yes.
Leia: Luke! Close the other gate!
Luke: It's already closed!
Leia: No, the other other gate!
Rancor: Silence, little lambs. You're putting me off my lunch.
Luke: Sorry.
Leia: Don't be sorry! That's the whole idea!