Scattergories Card Game
This is a combination of Scattergories and Slap Jack. When the category and first letter appears the first player to slap the "I Know" card gets to answer. Assuming it matches the category and starts with the letter the player gets to take the category or letter card, causing a new one of that type to appear. When one of the two decks runs out the game ends and the player with the most cards wins.