On a side note, Jari also raises another very important question:
The answer to this is yes. In fact, as a senior at Hunter College H.S., I participated in a water balloon attack against the neighboring Lycée Français that is the stuff of legend. (Anyone who has ever gone to school in the near vicinity of a Lycée Français needs no explanation for why we organized this attack.)
As water balloon attacks go, it was massive, involving four large cardboard cartons full of them, and a dozen or so students. It was also cowardly, timed for 4 p.m., as the unarmed lycéens poured out of the front doors after classes. Once a sizable amount had gathered on the sidewalk, we began lobbing from across the street. I’ll never forget the look on their faces when they realized what was going on. Unfortunately for them, the lycée’s concierges, obviously trained in the latest COIN tactics, reacted before they did, slamming the doors shut before the students could scramble back inside. We emptied the boxes, leaving them drenched from their own private rainstorm.
It was June in N.Y., though, so they were all dry before ten minutes had passed. Contrary to what you might think, the attack actually dramatically improved bilateral relations between the two schools for the few weeks left before summer break.
More recently, I organized a water balloon BB-gun shoot for my son’s birthday party some years back.