If you log into GTA Online today, you'll find a nice surprise waiting for you: snow.
Not only that, but you can use this snow to get into snowball fights...and, yes, you can actually kill people with snowballs, as this GIF shows:
After watching folks like TwoDynamic play, it seems like you might have a tough time getting into a snowball fight that won't devolve into some other random jerk swooping in and killing you and your target, but hey! Don't let that stop you. It looks like snowball fights are a ton of fun, and there are probably lots of people out there willing to indulge you.
Here's some more footage, in case you want to see more of what the snow looks like in action:
Top GIF: DomisLive footage.