"The game of life does not proceed like a mathematical calculation on the principle that two and two make four. Sometimes they make five, or minus four, and sometimes the blackboard topples over in the middle of the sum and the pedagogue is left with a black eye."

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What's that supposed to be anyway?" said Fred squinting at Dobby's painting. "Looks like a Gibbon with two black eyes!" "It's Harry," said George pointing at the back of the picture. "Says so on the back." "Good likeness," said Fred grinning. Harry threw his new homework diary at him.

— J. K. Rowling