Anytime you're curious about possible myths, urban legends, and crazy stories you hear or receive by e-mail, you should check out Snopes and The Straight Dope.
www.snopes.com www.straightdope.com
Snopes is a clearing house for urban legends, and they've got an awful lot of them archived, as researched by folklorists Barbara and David Mikkelson.
The Straight Dope is a column by Cecil Adams, in which the record is set straight on a number of perplexing issues. They also have an active message board, where if anyone has any questions about obscure song lyrics, I send them right to Mudcat.