One winter we dragged the discarded Christmas trees into the street to build a barricade.
When drivers got out to clear a path we pelted them with snowballs.
(Never rocks though)
Very funny; I can relate! We thought we’d pelt a bread truck driver with snowballs very early in the morning (3 am) by lining up garbage cans across the road - and he just kept going (dragging a shower of sparks - plastic cans weren’t so common yet).
In hindsight, he probably thought he was being set up for robbery...