UNO House Rules The Anime
The scene opens up in the middle of a UNO match.
The villain smiles. He plays his secret ultra-rare "Wild, Take 4, Choose the number" card. He gloats: "AHAHAHA! There is no way you'll ever win now! For by playing this card, I choose the color AND the number of the next card that must be played! And you lose a turn because you have to take four cards from my hand! And I only have five left, and I choose 7 green!"
The main character pulls four cards from his opponent, including the green #7. And as the villain stares at his last card in shock, our hero calls him out. "You didn't say UNO! So I can get an instant turn from nowhere and play my draw 9000 card!"
And that's when the series was cancelled.