@c&b: If you hit all the nitrous the cream/booze won't come out. (I assume they use nitrous, the site doesn't seem to say.) Can you still get nitrous capsules at head shops here? BTW, I chewed a betel nut in Taiwan, that shit's pretty wicked. Five minutes of chewing = effect of about 20 cups of strong coffee, at least to someone without any tolerance built up...
You can also, you know, take a mixer with a whisk attachment and put whipping cream and alcohol into a bowl and make it yourself. Craaaaaaaaaaaazy, I know.