Here's a website (scamorama.com) that includes the stories and exchanges of many others who have also answered the e-mails they have received offering mysterious fortunes just to see what would happen.
Update, 8/10: Wow, you could lose the better part of a day looking at this website (no, I didn't do that myself). It makes me realize how small-time my own little colloquy with Mr. Mongosutu is. Some of these people have taken their correspondences to lengths I never would. I only gave out my cel phone because it has withered because of non-use anyway.