[Colarmel]

RE: Intimidation: Working as unarmed security or a bouncer can do this well. I had a coworker working security in an area where a large part of security was telling the homeless they weren't allowed to sleep there. A homeless man pulled a knife on him. His response: "Put that $*#* away." The homeless man complied, and ran away.

Another method, depending on your GM, would be watching movies or TV with good "tough guy" characters. There's a scene in Justified where the protagonist racks the slide of his handgun, catches the ejected cartridge, drops it on a prone bad-guy he's intent on intimidating and says, "Next one's coming faster."

His explanation when he's later expected to explain why the bad guy has a bullet with his finger prints is that he saw a gangster telling the story on Johnny Carson, and thought it sounded cool.

It's also possible though, for that kind of training to have some conditional penalties for real tough guys, similar to overconfidence: it's likely that the scary guy in the movies will do something stupid that renders him silly to real bad guys.