Primary School Children know the answer "Which came first - the chicken or the egg?"

Children are asked to "Draw a ring around the item that needs to come first."

This example of tests in some educational books comes from "Weird Science" on the Daily Mirror website. It also included an example relating to teaching the Laws of Thermodynamics:

You can't shovel manure into the rear end of a horse and expect hay to come out of its mouth.

O.K. This is a highly memorable example if you are teaching thermodynamics to a class of 8 or 9 year old boys - but normally the subject comes a lot later in the school curriculum.