Shenanigans:

The name of a game played 24/7/365 by people who know of its existence. The
game is played by first saying "Shenanigans", then, the person who said it is
allowed to hit or otherwise hurt anyone within earshot of them at the time
that they said it. The main target tends to be the groin on males and the
chest on females. People who are within earshot when "Shenanigans" is said
must say the word "Mulligan" as soon as they hear it to prevent being a
target. If someone is hit either before or while you are saying the word
"Shenanigans" or after they have said "Mulligan", you are considered to have
cheated and they get a free hit on you. Note that saying "Shenanigans" lasts
indefinately until each person within earshot has said "Mulligan"

Bob: "SHENANIGANS!" *smacks Tom in the groin*

or

Bob: "SHENANIGANS!"
Tom: "MULLIGAN!"
*Bob hits Tom in the groin*
Tom: oooh, that's a free hit! *smacks Bob in the groin without penalty.*

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If life gives you melons, you may be dyslexic.