Two dour Scots are in a boat fishing. Suddenly Angus's rod bends double and he begins an epoch stuggle to land his catch.

After ten minutes he reels in a beutiful mermaid. He gently lifts her into the boat and gazes down in wonder at this lovely half woman and half fish.

Then he scowls and throws her back in.

"Why?" asks his fishing companion.

"How?" he answers.