It's an opportunity to provide information. Don't feel stupid for asking if something's true. (If you send it to 738 of your closest friends without checking, you can feel...well, naive at least.

For bookmarking purposes, the main Urban Legends site (where Don Firth found the information on this hoax) has a lot of infomation. There's an awful lot of interesting reading as well. The Inboxer Rebellion has most e-mail hoaxes, but this one was in "Toxins du Jour."