A number of years ago I was at a friend's house and he wanted to play Uno but he couldn't be cause his dog got into the deck and many of the cards were damaged.
I noticed he had a couple of packs of playing cards on his coffee table and upon closer inspection, I realized that each card in Uno maps to a card in 52 card deck. A standard Uno deck has 108 cards, which is a standard 52-card deck plus the jokers.
So we played Uno with his two decks of playing cards.
In fact, Uno exists because one family liked playing Crazy Eights but got tired arguing about the rules, so they started writing the rules on the cards and eventually made new cards: https://www.museumofplay.org/toys/uno/
That's interesting. I always assumed that UNO was a branded version of a very similar game we used to play as kids with a regular deck of cards (e.g. 7 is draw 2, Jack allows you to pick a color). The game is called Tschau Sepp and very commonly played in Switzerland. I just assumed other countries had their own version of it, and that UNO derived from it.
As with other commenters, we used to play a game similar to what is now Uno with a standard deck, we call it "pesten" (bullying), but the wiki page says it's similar to the US Crazy Eights, and internationally it's known as Mau-Mau [0].
I noticed he had a couple of packs of playing cards on his coffee table and upon closer inspection, I realized that each card in Uno maps to a card in 52 card deck. A standard Uno deck has 108 cards, which is a standard 52-card deck plus the jokers.
So we played Uno with his two decks of playing cards.