Every once in awhile you hear of someone who has fallen in love with a person that they probably should have just avoided in the first place. How many stories have we heard from celebrities that slept with their nanny? Or a teacher that has fallen for his student? Or how about even a parent that is dating one of their kid's friends.
Yuck.
Love isn't a random thing that just happens and makes you do crazy things. You CAN help who you fall in love with. Want to have a happy relationship? Avoid dating these people and you'll be a step ahead in the dating game.