And that's when I realized, making fun of her wouldn't stop her from beating me in this contest.

7 seconds sound clip from the Mean Girls (2004) movie soundboard.

You can hear this line at 01:24:46 in the Blu-ray version of the movie.

Quote context

[...]

- And from North Shore, Miss Cady Heron.

- It's Cady. (2)

- Oh, my God, that's me.

- Miss Caroline Krafft seriously needed to pluck her eyebrows.

- Her outfit looked like it was picked out by a blind Sunday school teacher, and she had some 99 cent lip gloss on her snaggletooth.

- And that's when I realized, making fun of her wouldn't stop her from beating me in this contest.

- Contestants, find the limit of this equation.

- Calling somebody else fat won't make you any skinnier.

- Calling someone stupid doesn't make you any smarter.

- And ruining Regina George's life definitely didn't make me any happier.

[...]