The fourth episode of Sam & Max: Beyond Time and Space
is now available on your iDevice, granted you have an iPhone 3GS and above. Episode 4: Chariots of the Dogs
includes a playable Whack da Ratz
mini-game and a Sam & Max soundboard. (Because ordering a large pepperoni from Domino's is less depressing when you do it as Max.)
It'll set you back $4.99 – about three quarters the cost of that Domino's pizza.