"Time flies like an arrow. Fruit flies like a banana." was used in the teaching of English as a foreign language to show how some words can crop up as different parts of speech flitting from noun to verb to adjective in a way calculated to drive poor students to more useful areas study like Latin (structured, elegant and extinct outside the Vatican) and Astrophysics (Find a fundamental and obvious truth, stick it in a black hole and show how untrue it is). "Blow flies like a cornet" is another you may find relevant - all Mudcatters know at least one person who claims to be able to get a tune out of anything, and Health Inspectors are eager to keep bluebottles out of ice-creams! Gaffer