With Halloween only one sleep away, Jennifer Garner is taking to social media to plead her case: Funny costumes are better than sexy ones.

In a hilarious Instagram post, the former “Alias” star shares a brief snippet of her speech at Ohio’s Denison College back in May, in which she offered some sage advice to graduates.

Addressing Denison’s class of 2019, Garner, 47, shares one particular piece of wisdom that is even more appropriate now than it was then.

RELATED: Jennifer Garner Shares Hilarious Life Tips During Commencement Speech At Denison University

“When it comes to Halloween costumes, go funny over sexy,” she declares. “Why would you dress like a flirty nurse when you could be a mailbox?”

The video suddenly cuts to the present, with iconic Halloween theme “The Monster Mash” playing in the background. Garner opens the door of her home and emerges… as a mailbox — and not a particularly unsexy one at that.

To use a tennis reference: game, set, match!

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Live your truth, people. Happy Halloween. 🎃

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That was not the only Halloween costume Garner showed off this year. While promoting a makeup remover, Garner displayed her wicked vampire. The highlight of the look was definitely the smoke coming out of her mouth.

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Spook-tacular Stars Are In The Halloween Spirit