My friend got me on the subject about vampire melons....and showed me a link.
(http://i114.photobucket.com/albums/n272/DaltonTrigger/vampiremelonpart4.jpg)

But to my mind when brought up melons I thought of a vampire watermelon...
Yes the horror....
it rolls towards your feet and when you pick it up it bites you on the neck!
I had to follow up this post with more "Valid" information...
such as:

http://en.wikipedia.org/wiki/Vampire_watermelon
http://cornell.elliottback.com/arch.....e-watermelons/

Have fun :3 just watch out for them melons