If I say, on Wednesdays we wear pink, youll know exactly what Im talking about.

While the movie is old now, it still holds up.

After all, we probably all know a mean girl in our lives.

Lacey Chabert, Lindsay Lohan, and Amanda Seyfried in Mean Girls (2004)

Lacey Chabert, Lindsay Lohan, and Amanda Seyfried in Mean Girls (2004) | IMDb

And if you dont, it might be you.

Its never a good idea to change yourself just to fit in.

She isnt the only one who does it in the movie, though.

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At the very beginning, Janice introduces Cady to the social structures in the cafeteria.

Everyones sitting in well-defined groups.

Dont spend your energy finding ways to tear other people down.

The biggest takeaway fromMean Girlsis how hurtful gossip can be.

It affects everyone around you.

She takes the info to Janice and Damian so they can gossip and plot.

Obviously, all that work does nothing good for Cady in the end.

You dont have a limitless well of energy.

Quit wasting it on others, even if those others legitimately suck.

You ARE really pretty, and its okay to think so.

Theres a classic scene when Cady is first hanging out with the Plastics.

Regina George tells Cady thats shes really pretty.

When Cady says thank you, Regina gives us this classic line: So you think youre really pretty?

Shes used Cadys thank you as a trap to insinuate that shes conceited.

Truth is, its not only okay for you to think youre pretty, but youshould.

You are gorgeous and you shouldnt let anyone prevent you from shouting it from the rooftops.

Wear your spooky Halloween costume with pride.

She arrives in a zombie bride/divorcee costume and is embarrassed to find that she stands out.

Girl, wear what you want.

Be that spooky zombie.

Dress as your favorite character.

Leave the sexy crossing-guard costumes for the people who actually want them.

If you pretend long enough, youll no longer be pretending.

Thats the danger with pretending to be something that doesnt fit your morals or interests.

Soon, Cady starts to actually value her friendships with Regina, Gretchen, and Karen.

How could they be mean to her?

Shes one of them now!

If someone shows you that theyre terrible, dont give them an ounce.

Believe them and move on.

Everybody has the potential to become a mean girl.

It unleashes the mean girl in the entire junior class of girls.

Check yourself before you get going talking shit about the people around you.

Cool moms arent actually cool.

Amy Poehler stars as Regina Georges mom.

Her scenes always resonated with so many because everyone knows that one cool mom.

I think we can all agree that the cool mom is anything but cool.

The right guy will like you the way you are.

Poor Cady thinks she needs to act dumb to get Aaron Samuels to like her.

In the end, he likes her only when shes being herself.

Then hes not worth it.

Being honest about your feelings goes a long way.