Yet another one of Disney’s magic-enhancing tricks.

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When it comes to keeping the magic alive in their theme parks, Disney Imagineers have plenty of tricks up their sleeves. From their notorious “Go Away Green” paint used to disguise unpretty elements to their aggressive mosquito abatement methods, there’s a lot that goes into making each visitor’s experience extraordinary.

And apparently even their restrooms have been tinkered with for maximum, well, enjoyment.

Have you ever wondered how Disney World manages to keep bathroom lines moving quickly during its peak seasons? Their trick, it turns out, is surprisingly simple. As one Apartment Therapy writer recently observed, nearly all the restrooms in the park have one thing in common: they’re missing over-the-sink mirrors.

“This is to increase traffic flow,” one Disney World custodian explained on Quora. “We don't want guests (particularly females) to spend five minutes or hours fixing themselves in front of a sink when there are twenty people behind them needing to wash their hands.”

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Instead, the bathrooms typically have one large mirror inside near the entrance for guests to use as needed. The effect? Limited bottlenecking caused by primping, powdering, and futzing in front of the sinks. This way, all you can do is wash your hands and be on your way. Brilliant right?

So, the next time you go to Disney World, it might be a good idea to bring a compact mirror for your purse!