Ballbusting ideas I want to try, but can't without crushing someone's nuts

So I wanted to list some of the ballbusting methods that I would Absolutely LOVE to try... but probably couldn't do without causing serious injury to the participant (and I imagine there way to painful for most guys to even want to be a part of) so I listed them here to keep all of those fantasies alive and kicking.

-a Vice (it basically closes two small metal walls together, I'm sure you get the idea)
Some people have said this can be done if done carefully but the risk of accidently popping his nuts irl is to strong for me to be comfortable with it.

-Hot coffee

Working at Dunkin Donuts might have something to do with this one.
If I could just "accidentally" spill a whole pot of coffee directly onto some dickheads nuts I think I'd die happy

-Hammer

This one's pretty simple
I'm sure you get the idea
🍆
🍑🔨

-Doggy shock collar

A little shock collar that tightens around there nuts, the voltage can be activated and readjusted with a remote control.
I just press a button and he's on the ground screaming, if he tried to stop me or even get close to me I just have to turn the voltage up🤷

-Idk what to call this?

Okay so hear me out
You tie a rope around both of his ankles, use the rope to suspend him in the air upside down with his legs spread, and tie his hands behind his back so he can't cover his testicles.
Put your heel of his crotch and use both of his ankles to pull yourself up so you're standing with both of your feet on his squishy bits. From here you can stomp, grind and shift the weight of your feet onto his package. (I'd keep him somewhat clothed for this so his nuts can't slip away)

-Hanging

By far my favorite idea, tie one end of a rope around there sack, and throw the other side over a branch or something, pull slowly.
First there nuts will begin stretching upwards, they'll try to stand of there toes to relieve the tension, eventually they'll be flipped upside down on his back and then suspended into the air, The idea of some guy trying to grab his nuts, flailing his legs while he's dangling by his balls is really funny and I wish I could pull it off without accidently pulling them off🍒
You can also do the same thing as before but have the rope pull his nuts up and behind him. He'll be forced into an awkward half handstand and be unable to even reach his nuts because there halfway up his back