Season 9: Episode 199: The One with Ross's Inapproprate Song
Ross makes Emma laugh for the first time, by singing "Baby Got Back," which offends Rachel (until she finds she can't make Emma laugh any other way). Joey contemplates investing in an Emu farm, but Monica says he should invest in real estate, and suggests her ex-boyfriend Richard's apartment, which is up for sale. While Joey and Chandler look over Richard's apartment, Chandler finds (and steals) a video tape with Monica's name on it, worried about what might be on it. Chandler confirms that it's a sex tape, and Monica tries to calm him down, until she realizes that it's not her on the tape; then she's upset that Richard taped over her. Phoebe goes to dinner at Mike's parents place, and makes a terrible impression; but learns that Mike loves her.