A husband, wife and son are barely making ends meet on their farm. One morning the woman sees the family's only cow lying dead in the field and hangs herself in desperation. When the man awakens, he sees his wife and cow dead and shoots himself. The son finds his parents dead and goes to drown himself, only to discover a mermaid at the river. The mermaid tells him, "If you have sex with me 10 times in a row, I will revive your parents and the cow." "Why not 20?" replies the son. "Fine," she says. "Twenty it is." "But wait," says the boy. "How do I know that 20 times in a row won't kill you like it did the cow?"