If you are Real Madrid, and you waited 18 years to win the Copa Del Rey, and you did it by defeating your arch nemesis and rivals Barcelona, how do you celebrate?
Open roof bus? Done.
Drop the cup under the bus? Done and done!
Here, watch. It's a boring video, if you're a non-Real Madrid fan, but check out the :06 mark (actual dropping of the cup and bus running over it) and :40 mark (where you can kind of see the cup under the front wheel of the bus):