An unbelievably hot woman appears to seduce the protagonist, but ends up humiliating and rejecting him. He then finds out she is the acne-ridden wallflower he ridiculed in High School -- all grown up, but still bitter. If she's really pissed off, this plot can morph into Reunion Revenge. Compare Something's Different About You Now, where he hits on her... only to find out she used to be a "he". Not often seen gender-reversed, but it's not unheard of. Examples: