We had an arranged food fight after exams were finished when I was 16. We met in a park with (mostly) flour, eggs and ketchup and the 60 odd of us went at it.
Then some locals called the cops and 10 policemen showed up and everyone ran for it. I was a sprinter so was one of the first out of the park, straight into the waiting arms of the policeman waiting just outside the gate. Then 30-odd kids barreled through him (2 exits) and I squirmed away and legged it to my nearest friend's house.
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Such a good day.