The following questions were set in last year's GCSE examination in England.
These are genuine answers from 16 year olds, not very bright, but entertaining, 16 year olds.
Q. Explain one of the processes by which water can be made safe to drink
A. Flirtation makes water safe to drink because it removes large pollutants like grit, sand, dead sheep and canoeists
Q. How is dew formed
A. The sun shines down on the leaves and makes them perspire
Q. What causes the tides in the oceans
A. The tides are a fight between the earth and the moon. All water tends to flow towards the moon, because there is no water on the moon, and nature abhors a vacuum. I forget where the sun joins the fight