I also heard that you should watch the movie until the credits are over. Is this true? I may have read this here.
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In that latest commercial, Roger responds to Barnabas' line about big balls with something akin to "not THAT'S what I'm talking about!" So, in other words, there's still more humor waiting to be played out...
And you just know where SGS was going with that line.
Then again, Barnabas does appear to quote Love Story to the hippies. It's unclear whether he will have been aware of that movie before he encounters them.