In "Brother, Can You Spare a Blonde?" David talks about how Richard can never hold down a real job and keeps getting into crazy investment schemes. David says Rich tried to invent a weird product, liquor shots in those little packets they use for ketchup.
Well, it's not so odd anymore: I saw those at the store the other day. No kidding! They have these frozen little packets of vodka or whiskey, in one-shot servings, and you can use them for drinks or what have you. They're tiny wrappings, about twice the size of a little ketchup packet. I forget the brand name, but it was so funny when I saw it.