Monica: So, what is it? Is it? Is there a problem? Is there a problem with me, or with you?
Chandler: Actually, it's both of us.
Monica: What?
Chandler: Apparently, my sperm have low motility and you have an inhospitable environment.
Monica: Oh. Well, what does that mean?
Chandler: It means that my guys won't get off their Barcaloungers and you have a uterus that is prepared to kill the ones that do.