Photos: Anatomically correct mushroom fungus and other weird school posters

As you know from seeing our past collections of bizarre discussion placards from the '70s, we love vintage school posters -- and we found a treasure trove of them on, including erotic plants, smiling tighty-whities and more.

Count down our top fifteen below, and click on the links if you'd like to make one of these oddities part of your personal collection.

Number 15: Talk about a come-hither look....

Number 14: "Let's check the Bible to make sure God made these."

Number 13: Doesn't the underwear look a little too pleased with himself?

Continue to see more of our top fifteen vintage (and strange) school posters.

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