"Did y'all know that you can only play the Draw 4 Wild card IF you have NO other cards that can be played? AND if you suspect that someone has illegally played this card, they have to show you their hand. AND if they in fact played the card illegally they must draw 4, but If not, the person who challenged the play must DRAW 6?
Her post has since gone viral with thousands of people losing their minds.
"OMG I had noooooo idea!" replied one woman on Facebook, "Mind officially blown!"
"What? I've been playing this wrong my whole life," wrote another.
Others did not react kindly to discovering they'd been illegally UNO-ing for years.
"Well damn I been playing wrong," commented another player, "but I'm not switching it up."