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When Jack does something so crazy and brutal it makes your brain explode and your mom cry. It's like when he kicks a door in and then eats a grenade for breakfast.
Jacktion happened when he shot three guys with one bullet and then yelled at the sky.
I saw a Jacktion when he broke a chair in half with his bare hands and then laughed.
That was a Jacktion! He jumped out of a plane and landed on a terrorist like it was a couch.