"The barman gives you a cheese sandwich. The bread is like the stuff that stereos come packed in, the cheese would be great for rubbing out spelling mistakes, and the margarine and pickle have performed an unedifying chemical reaction to produce something that shouldn't be, but is, turquoise. Since it is clearly unfit for human consumption, you are grateful to be charged only a pound for it."
-Infocom's Hitchhiker's Guide to the Galaxy