Though initially RPGs and RPG campaigns were heavily inspired by literature, it didn't take long before other media made their influence felt -- including other games. This was true even of myself, who generally tried to avoid mixing one game with another back in the day. But, for my 12th birthday in 1981, I was given a card game called Dragonmaster and I fell in love with its beautifully illustrated deck, whose suits depicted four contending noble families. In fairly short order, I found myself using the cards to represent NPCs in my campaign, a practice I continued for a very long time.
Though I no longer have the game -- though I wish I did -- I think back fondly on how I used it in conjunction with D&D. So, my question for today is: did anyone else do something similar with a non-RPG? If so, what non-RPG game did you incorporate into your roleplaying campaign and how?