Internet Tough Guys are people who will threaten anyone online who bugs them enough with physical or legal harm. These threats are always empty. These bullies couldn't fulfill most of these threats even if they wanted to. If you ever find yourself on the receiving end of these threats, just remember that most of these people are morons who wouldn't even be able to figure out your IP address.
Not surprisingly, Trolls love these morons. Rants, ineffectual threats, and anger being the stuff trolls live on.
Common Internet Tough Guy threats include lawsuits (that would immediately be thrown out of court); extreme violence against one or more people; calling people's parents (works best against the young); use of the U.S. Constitution or US statutes against non-American forum owners; and calling for the banning of someone who expresses a viewpoint that they disagree with.