A father walks into a restaurant with his young son.
He gives the young boy 3 nickels to play with to keep him occupied.

Suddenly, the boy starts choking, going blue in the face.
The father realizes the boy has swallowed the nickels and
starts slapping him on the back. The boy coughs up 2 of the nickels,
but keeps choking. Looking at his son, the father is panicking,
shouting for help.

A well-dressed, attractive, and serious looking woman in a blue
business suit is sitting at the coffee bar reading a newspaper
and sipping a cup of coffee. At the sound of the commotion, she
looks up, puts her coffee cup down, neatly folds the newspaper
and places it on it on the counter, gets up from her seat and
makes her way, unhurried, across the restaurant.

Reaching the boy, the woman carefully drops his pants; takes hold
of the boy's testicles and starts to squeeze and twist, gently at
first and then ever so firmly. After a few seconds the boy convulses
violently and coughs up the last nickel, which the woman deftly
catches in her free hand.

Releasing the boy's testicles, the woman hands the nickel to the father
and walks back to her seat at the coffee bar without saying a word.

As soon as he is sure that his son has suffered no ill effects,
the father rushes over to the woman and starts thanking her saying,
"I've never seen anybody do anything like that before, it was fantastic.
Are you a doctor? "

"No," the woman replied, "I'm with the Internal Revenue Service."
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There are 10 kinds of people.
Those that understand binary and those that don't.