↓ Transcript
Sir Iris: How's your swimming, ol' boy?

Dave: Not THAT good.
Dave hops up on a barrel.

SFX: Thuk!
Dave knocks on the barrel again.

SFX: Thuk-thuk!

Dave: That sound hollow to you?
Stomping furiously.

Sir Iris: Indeed.

Dave: Are you thinking what I'm thinking?

Sir Iris: Jolly-good hiding spot?