There used to be a channel called "Voice of Reason" or "Voices of Reason," on YouTube and there was this video where a bunch of girls had to come up with punishments for a guy. Like halfway through they start talking about ballbusting. The 'script' was something like:

Girl 1: "Kick him in the nuts."

Girl 2: "Kick him in the nuts."

Girl 3: "oof... that's a lot of pain..."

Girl 1: "and don't be a bitch, like, [imitating a man's voice] 'Ok, if we're gonna do this, but I'm gonna wear a cup. [/imitate] No. The point of wearing a cup is so that it doesn't hurt, but the reason we're kicking them in the nuts is so it does hurt... yikes. I used to practice on my little brother, hahahahaha

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Other similar ballbusting threats would also be good.