I assume you all know the story of how
Odin traded one of his eyes for a drink from the
Well of Wisdom. Well, according to
The Mad Bard, that's where the old saying comes from:
Don't run around the pool deck with scissors in your hand less than thirty minutes after eating, because it's all fun and games until someone loses an eye.
Saying from post by The Mad Bard on alt.mythology on February 2, 1999. It stuck in my mind that long.