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  5. Knock on wood is a saying for good luck. I think that...

Knock on wood is a saying for good luck. I think that started when someone went to someone's door to see if someone was home. "I hope Joe's home, knock on wood!"

Mitch Hedberg
Funny, Home, Humor
Knock on wood is a saying for good luck. I think that started when someone went to someone's door to see if someone was home. I hope Joe's home, knock on wood!