There are way too many to choose from but my personal favorite is the Bloody Mary legend. I have scared the shit out of so many people that do the mirror thing.
My Favorite urban legend is about kids prank calling people but they end up calling a serial killer that goes after them. not too sure what urban legend that is exactly but i heard Dead Tone is a movie coming out based on it, however, i think its being banned for being too graphic.
I don't know if there is a name for this legend, it's about some guy/girl who's just about sitting down in a seat in a movie theatre and suddenly something stings him in the ass. under the seat is a message "A needle with my blood has stung you, you have now HIV!" A lot of my friends heard of that and believed that somewhere is maniac spreading HIV...
It's that time of the year when we celebrate the many gifts that the great Spill Kings and Queens bring us all through the year. And for this we celebrate there awesomeness.
Bless Spill and all its followers.