Back in the day, when Gardena CA had 5-card draw for high & lo-ball, they used a 53-card deck which included 1 joker. Known as a "bug", it was good as an Ace or to complete a straight or a flush (or straight flush). The bug was included in the high-draw games. I don't recall if it was used in lo-ball too, though probably so?

These days, I don't know of any actual casino game that uses a Joker. Am I missing any?