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Jackson's Law says the cooler the thing you do, the fewer people will see it. The more embarrassing, the bigger the crowd that will laugh at you.
I pulled off a one-handed push-up in the hallway. No one saw it. Then I tripped and face-planted into the trash can. The whole school saw that.
I sneaked a muffin into the principal's office. No one saw it. Then I got caught eating it in the middle of the gym. Everyone saw that.
I did a sick skateboard trick. No one saw it. Then I fell off the ramp and landed in a puddle. Everyone saw that.