Shared apartments run on unspoken agreements, but sometimes expectations can get a bit out of hand.

So when one woman quietly celebrated turning 24 with a few close friends while her roommate was out of town, her roommate reacted like she had thrown a full-scale rager.

And somehow, a harmless low-key celebration turned into accusations and demands for extra utility payments.

You’ll want to keep reading for this one.

AITA for inviting friends over on my 24th birthday when my roommate was out of town and I was completely alone?

I turned 24 yesterday.

My roommate (23F) knew it was my birthday because I had mentioned it multiple times. My family lives across the country, so I had no plans and was prepared to spend the day alone.

So when her roommate left too, she decided to host some friends to celebrate.

Later, my roommate decided last minute to spend the whole weekend (Fri–Mon) at her boyfriend’s place, and I got the apartment to myself.

On my actual birthday, Sunday night, I posted on my private story that it was my 24th birthday.

I invited three of my friends, and they showed up at 8 p.m. with cake and champagne to surprise me.

By her accounts, it was a perfectly chill celebration.

We hung out in the living room, kept the volume normal, cleaned everything, and they left by 11:30 p.m. No mess, no damage, no loud music.

I just went to bed, and in the morning my roommate came home. Monday morning, she saw leftover balloons and flipped out.

Her roommate, however, saw the scene very differently.

She says I threw a party, that I should have taken permission even though she wasn’t here, and that having anyone over without her permission isn’t okay—even when she’s away.

She says this breaks our house rules.

Now she’s making unfair demands and spreading gossip about her.

She’s now demanding I pay extra for utilities because other people used power and water.

I found out that she told some of her friends I’m inconsiderate and took advantage of her being gone.

She’s finding herself second-guessing everything.

And that got me thinking.

My friends are saying I should have just spent the day alone to respect the rules.

So AITA here?

It sounds like this roommate just wanted an excuse to save a little money on utilities.

What did Reddit think?

This commenter thinks it’s high time to find a better roommate.

It seems like her roommate is trying to punish her for something completely normal.

It’s very dramatic to act like having three friends over is the equivalent to throwing a rager.

If it were this commenter, they would think twice about continuing to associate with this controlling roommate.

Her controlling roommate was the real problem here, not her low-key birthday celebration.

It’s situations like these that truly show a roommate’s true colors.

If you thought that was an interesting story, check out what happened when a family gave their in-laws a free place to stay in exchange for babysitting, but things changed when they don’t hold up their end of the bargain.