Ross: Okay, Pheebs. See how I'm making these little toys move? Opposable thumbs! Without evolution, how do you explain opposable thumbs?
Phoebe: Maybe the Overlords needed them to steer their spacecrafts.
Ross: Tell me you're joking.
Phoebe: Look, can't we just say that you believe in something and I don't?
Ross: No, Pheebs, we can't. Okay, because it's like math. One plus one equals two. I can't stand by and let you think that one plus one might equal three, or four, or yellow.
Phoebe: Why not? What's this all about? What is this obsessive need you have to make everybody agree with you? What's that all about? You know what, I think maybe it's time you put Ross under the microscope.