I was watching The Misinterpretation Agitation (season 8, episode 7) of The Big Bang Theory the other evening, and noted that the pre-opening credit sequence was centered around Penny, Bernadette & Amy: with none of Raj, Howard, Leonard or Sheldon present. It seemed a nice change to kick the show off with the female talent.
It got me to wondering though, is that the first episode of BBT to do that? I checked the IMDb page for that episode and there was no mention that it was the first. Was there an earlier episode that excluded the guys from the pre-credit sequence?