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1.
When grating cheese, as you come to the end of the block you find that there is a small piece that you are not able to grate fully due to its size.

As the cheese grater (not the same as cheese grater), you are entitled to consume this tiny piece of cheese yourself.
"I think you'll find that, having successfully grated this gigantic wedge of cheddar, I am entitled to the cheese grater's perk. Good day to you, sir."
by C3POwen October 06, 2011