On "Penn & Teller: Bullshit", there was an episode where one of the people they interviewed was a woman who's initially seen carrying a large stack of envelopes, and Penn on voiceover said something like, "We told the previous guy that we wanted to see a woman with really ... big ... envelopes. He's foreign; he didn't understand that, in America, every plural noun means tits." So there may be some regional variation.