Dice games. They're usually pretty quick to play. Just roll some bones and see what you've got. If you're looking to add some more to your collection, as they tend to be pretty family-friendly and great for occasions where you want just a fast pick-me-up, AEG is running a sale on their dice games over in their webshop now.
From the announcement:
Get rolling with all these great dice games and more! Check out city builders like Dice City, strategic resource management like Istanbul, and co-op monster fighting in The Masters' Trials. These and many more dice games are 25% off for a limited time. Don't miss it!