eagle formation
When you're riding in a car with someone else and you both decide to be silly by flinging your doors open while the car is still rolling. It usually ends with someone screaming or something breaking.
We were on the way to school and did eagle formation and my door hit a tree.
My friend and I did eagle formation on the way to the mall and almost got stuck in a ditch.
I did eagle formation with my brother and his door flew open and hit a trash can.