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 Etsy.com, 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?
Number 11: Who knew mushroom fungus could be so arousing?
Number 10: "Mom, you know you're giving me cat food, don't you?"
Number 8: And you thought mushroom fungus was arousing....
Number 7: This is Peter's what?
Number 5: Cheap at twice the price.
Number 4: Do you only have to honor them if they have halos?
Number 2: "But when I grow up, I want to be a designer of really high-waisted pants."
Number 1: "But it smells so good!"
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More from our Lists & Weirdness archive: "Bizarre classroom posters from the '70s, Part 3: Behold the roots of memes."