from The Goon Show Series 9 Episode 8: Queen Anne's Rain.

Henry: You get on baiting those elephant traps.
Minnie: I don't see the point of them, you know.
Henry: What?
Minnie: We've never caught one.
Henry: That doesn't mean we must stop trying, Min of mine. Think of the dangers! Supposing you came down one morning for a cream-strainer, and found an elephant in the larder, eh?
Minnie: Well, I've never seen an elephant in the larder.
Henry: That is because they're hiding, Min of mine.
Minnie: Where do elephants hide? Tell me that! Where do elephants hide, buddy?
Henry: Well, I don't know, Saxophone-Min, but it's clear to me that they must hide somewhere. How else could they get away with it for so long?