Probably the dumbest/most dangerous prank that's been going viral for a the past couple of years. Basically it's when someone figures out a person's address and calls their police department with a totally made-up situation that causes the police to respond with a task force.
The most recent incident of these just shows how dangerous it is to do this. Peep the story below.
For a more in-depth breakdown of the situation. Youtube's MrTheRevertz gives his take.
The point being this, whether you think it's funny or you're trying to get back at some person you got mad at in a virtual space, this is dangerous and careless. And in extreme cases, as is this one, fatal.
R.I.P. Andrew Finch