Tower: "Skylane Eight Seven Charlie, cleared for the approach; caution, waterfall in the area."

Short silence, presumably while the Skylane pilot questioned passengers on the transmission.

Skylane: "Eight Seven Charlie, say again?"

Tower: "Skylane Eight Seven Charlie, cleared for the approach; caution, waterfall in the area."

Again, short silence.

Skylane: "Ah, cleared for the approach, but what do you mean by the waterfall caution?"

Tower: "Waterfall, you know: Ducks and geese...Waterfowl."