Joining a friend's (Or enemy's) group Skype call, just to burn and humiliate them, then leaving.
Guy1: So what did you do last night?
Guy2: Oh I just did a Skype Assassination on Joe.
Guy1: Lol what did you say?
Guy2: I told everyone that Joe used to piss himself till he was 15.
Guy1: Dude that is harsh but hilarious.