What's the worst date story ever to cross Fluther's threshold?

We’ve all heard horror stories surrounding the dating scene. Sometimes dates just go downhill on their own for some reason, with hilarious and embarrassing outcomes that are often worth adding to our arsenal of yarns. Or, it could have been that through an unfortunate series of events (or fortunate, depending on your viewpoint) you became the worst date ever.

Describe the worst date you, or a friend you know have experienced. Your story could become legend on Fluther, or stuff of urban legends if it gets outside these collective walls.