JENNIFER ANISTON: “Vince, honey, your hair is getting thin!” VINCE VAUGHN: “So who wants fat hair?” Okay, that conversation never actually happened, but… Jennifer’s worried her boyfriend’s gradually going bald, so she bought him a dozen bottles of “guaranteed” hair-growing glop from a chic Paris shop — a cream concocted from “sheep sperm.” Baaaa-ah! But the first time she slathered it on Vince’s receding hairline, he complained it stung like hell! Baaaa-AH! Jen phoned the Paris salon and was told stinging is normal and would stop after a few applications. They also told her to call back if Vince showed signs of pregnancy. (Oh, I’m kidding! Grow up.)