It's easy... you break into the victim's flat, and wait just behind the door with a machete.
When the victim comes into their flat, slash violently at their neck area, several times if necessary. Make sure you're wearing cheap clothes that you're willing to burn, and have a change in a plastic bag in the bushes nearby, as well as a number of towels.
In my experience, this always stops prank wars quickly, effectively, and at a relatively low cost.
When the victim comes into their flat, slash violently at their neck area, several times if necessary. Make sure you're wearing cheap clothes that you're willing to burn, and have a change in a plastic bag in the bushes nearby, as well as a number of towels.
In my experience, this always stops prank wars quickly, effectively, and at a relatively low cost.