Snopes is required reading for people on the Internet. If it sounds too good to be true, if it's a little too conveniently in favor (or against) your favorite ideological position, or if it's a little too horrifying to be true, check it on Snopes before you get upset, or worse, spread the claims further. Because you'll meet someone who has nearly the entire site indexed in their head, and there's little that's more damaging to your point then to have it conclusive rebutted on Snopes.
I'd just like to take this opportunity to thank Barbara and David Mikkelson (FAQ link substantiating the names) for providing such a fine resource to the Internet.
And it's darn fun stuff, too.
Pass it along.