The event, which was promptly dubbed "Massive Snowball Fight," was first proposed by student Carlos Sandin as a joke, but after around 2,000 registered on Facebook, it became very real.
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Sandin even made up a set of rules, although we're not sure how strictly they were followed or enforced. Either way, here they are:
1. Snow balls only (no rocks, no sticks, no ice etc.)
2. No snow balls thrown until 3 p.m.
3. If you're not part of the fight (taking a break) put your hands up and move out the way
4. Don't hit anyone with their hands up
5. Don't hit anyone with a camera (or the drone)
6. Take care of each other, don't be a d*ck
7. Have fun!
8. Snowmen/women are protected citizens, if you hit one you're getting bundled…
Overall, Massive Snowball Fight was a definite success, some snowballers even compared it to a scene out of Braveheart.