A similar variation of this one was posted earlier, but I like it better this way.
A man walks into a bar and asks the barman for his finest, single malt whiskey. The barman gives him a shot of it, and the guy downs it one gulp. This happens again a few times until another guy asks "Man, thats three shots of the best single malt whiskey, its expensive and hard to find. Why are you in such a hurry to drink it?" The man replies, "You'd be in a hurry too if you had what I have." "what do you have?" And the man replies, "Fifty cents."