Replying to co-workers with a Snopes link?

I would probably choose this course. I think people tend to heed us better when they aren’t embarrassed or angry.

I think I would be prevented from taking this sound advice by imagining the Ponzi-esque effect of all the recipients emailing all their friends, Snopes-free, in the interim.

I’d say something like:
Interesting, but luckily you can rest easily: http://snopes.com/whateverProvesTheyAreAGullibleDimwit.html

Well since AHunter included his response I’ll throw in mine.

Now these circumstances required a more delicate touch. This was from a parent of one of my students and I sent my reply only to her. I won’t include the original email since you can get the general idea with what I wrote: