The fuzzy/gritty feeling on your teeth that you get from eating raw or cooked spinach. The feeling is caused by oxalic acid crystals that coat your teeth, not by iron as many believe.
When your mother / father keep pestering you to eat you vegetables, and continually question you about it, despite the fact that you have told them NO 47 times already.
Mother: If you don't eat your vegetables, you won't get any ice cream afterwards...
Son: I don't give a damn! I don't want to eat my vegetables!
Father: Why don't you want to eat your vegetables?
Son: I just don't want -
Mother: Tell your father why you won't eat your vegetables now!
Son: Bloody hell, ma! What is this, the Spinach Armada?