A guy walks in to the driver's license station, and needs to take the vision test.
"Read line four, please."
Somehow he knows which one is line four. But he doesn't know letters, so he has to describe them to the satisfaction of the nice person listening.
"A straight line with two boobs, the right side of a square, a line standing upright, a line with a flat roof, a lightning bolt on its side, a straight line with an arrow pointing at it, a straight line with a boob on top playing footsie, a second line standing upright, half a square with an upper and lower deck, and a curly letter with a shelf."
"That's very good, sir."
(If you can't decipher all that, it spells BLITZKRIEG.)