This time the game is more obviously Bridge (although it could be another bidding game like Spades, I suppose). A nice, subtle touch here is the smile on Patty's face.
For those who are not familiar with the game... In Bridge, a good hand is generally one in which you have one suit with a lot of cards. If you're the highest bidder then you determine which suit is trump, so if you have a strong suit it's mostly to your advantage to bid high. But there are many other factors at work as well. For a game that so limits the types of actions available to players, Contract Bridge is remarkably subtle and deep.
To add to the list of things Snoopy can say: *gasp*.