Adult Chris: [v.o.] I was still hoping to make some progress with Tasha, but Greg was convinced all hope was lost.
Greg: Dude, once a friend, always a friend. It's the Westermarck effect.
Chris: West what?
Greg: Edward Westermarck. He was a scientist. He concluded that when two people live together in close proximity during the early years of life, they will never become boyfriend and girlfriend.
Adult Chris: [v.o.] That means I still have a chance with Shakira.