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When you're cruising down any road (especially a highway or a big street) with someone in the backseat. The driver yells 'eagle formation' and both the driver and the backseat buddy slam their doors wide open while the car is still moving.
I was on the highway with my cousin and he yelled 'eagle formation' and we both nearly got killed by a truck.
My bro and I did eagle formation on the 405 and got a ticket for being stupid.
My dad called out 'eagle formation' while driving and my mom almost hit a mailbox.