I'm going to prank homeless guys by pretending I will give them cash and then punching them in the nuts
Why would you be so cruel!?
I just feel like I'm living in a jungle!
That does not seem like a prank, that seems mean! You should try to be nicer to homeless people since they have already been through a lot.
My idea is to make homeless guys aware that they can't be so greedy.
How are they being greedy? And even if they were asking for too much, you could always just refuse instead of assaulting them.