Were you ever attracted to someone you shouldn't have been?

Who was it? What happened next? Have you ever fallen for a girl you weren't all that physically attracted to?
By that I don't mean unattractive, just that she isn't your type physically, and/or less attractive than other girls you could get/had been with. I'm only talking about physically, of course there are many other factors that go into attraction and desirability as a partner. How did it turn out? Did you ever find yourself becoming more physically attracted to her (or her "type") as a result? Was there jealousy from her knowing/caring that you're more attractive than her? Or did it just not matter at all because of everything else you liked about her? Have you ever met a woman so attractive that you became a dysfunctional human being? How was it? Can you describe her? Have you ever suddenly been attracted to someone after you found out something about them?