Bunnee?
i don't find it funny at all
That's entirely your opinion. There are about 6~ others who do find this funny. If you are so insulted by our joking around, you really have no place here on the Internet. That, and the whole window scenario? First, you would need 3 friends to begin with, so there's already an error. Second, that would be damage to private property, which would be a Criminal offense, possibly criminal mayhem (another offense) and he would most likely be at liberty to use the castle doctrine to it's full extent, that is to say;
A Castle Doctrine (also known as a Castle Law or a Defense of Habitation Law) is an American legal doctrine that designates a person's abode (or, in some states, any place legally occupied, such as a car or place of work) as a place in which the person has certain protections and immunities and may in certain circumstances use force, up to and including deadly force, to defend against an intruder without becoming liable to prosecution.