Dailies | Rachel McAdams Picks Favorite ‘Mean Girls’ Lines Ahead of 10-Year Anniversary (Video)

And it’s not “Boo, you whore.”

“Mean Girls” turns 10 this spring, so naturally, a bubbly red carpet correspondent decided to ask grown-up Regina George what her favorite quotes from the 2004 teen comedy were, and the former mean girl had trouble coming up with them.

“Oh, um,” Rachel McAdams said when put on the spot at the Sundance Film Festival. “Oh my God. I guess, uh…”

Either McAdams hasn’t watched the movie in a while, or her enthusiasm has diminished for it over the last 10 years, during which she has probably been asked the exact same question 10,000 times.

See video: Philip Seymour Hoffman, Rachel McAdams Play Spy Games in Trailer for ‘A Most Wanted Man’

One of two favorite quotes is the “Toaster Strudel part,” which McAdams thinks is “pretty funny,” even if she can’t exactly remember the line.

“Is butter a carb?” she added.

Watch the interview (above) to see McAdams — who will next be seen alongside Philip Seymour Hoffman in upcoming spy drama “A Most Wanted Man” — search her memory to try to appease her interviewer.