I have a similar story! My family was having a reunion at a restaurant but some people didn’t know how to get to the restaurant (before GPS or mapquest), so my dad told them to follow him in their cars. My dad was driving in the first car and there were like 3 other cars behind us with family. As were driving on the highway my dad dumps a bag of pistachio shells out the window (idk where he got the bag from) and pelts all my family’s cars. It was so funny when we got to the restaurant and all the cars behind us were super confused about the pistachio shells.