Once upon a time, a friend had us play in his homemade game. In this game, Luck was a stat. Luck was a unique stat in that you rolled d100 and that was your Luck score. You could then spend Luck points in the game to modify events.

I rolled a 100.

A friend who was known for being unlucky rolled rather poorly. But with Luck, you get one reroll. So, he rerolled and got a result of 1. He had 1 point of Luck.

That was a funny game.