Water gun. Then you can aim it directly at their face and get their entire mask soaked in it. Bonus points for dehydrated, stinky piss.

that's harder to fill with piss and

No way, it's very easy. You just put the balloon on like a condom and unleash the beast

Those of us who have been on the internet too long have seen a glass jar fuck someone up pretty good.

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Maybe something like the plastic balls that are filled with bright orange dye that they have in convenience stores in Japan to throw at escaping shoplifters.

But with piss, of course.

I just piss directly on the cops, you don’t have to carry around any incriminating evidence and you can easily adjust the piss level to fit the situation. No “one piss fits all” solution means you can piss on way more cops per gallon of water.

I believe this is where reusable water balloons can come into play