What's the best way to demonstrate to an adult that temper tantrums are a turn off?

Some people love to display a temper tantrum and I use the word display because the person I know will never throw the tantrum in another room where there is no audience. I can't help but wonder that if they got to see what an adult temper tantrum looks like, they just might realize how silly they look. Video taping the person is not an option because he's threatened me that if I ever do that, I'll be sorry. Are there perhaps any movies in which a character throws frequent embarrassing temper tantrums? If the person I knew had a better sense of humor, I would love to do a montage of his tantrums and between clips show toddlers doing similar tantrums. I'm not to good at making videos anyway, so I couldn't do it even if he did have a sense of humor. When someone held a mirror to my face, so to speak, to show how much talking I do about topics that interest no one but me, I learned to tone that habit down. This particular person loves to rant so much that he exaggerates his reaction to something on tv news. I swear he thinks tantrums make him cool. He has often implied that people who don't get angry and fight back are losers. The only problem is, there is no "enemy" he is fighting when he throws a tantrum and breaks a lamp. He has done that as a reaction to a news story about gang violence, yet there were no gang members in the room. He loves his anger so much that I've seen him pick fights with perfect strangers and no matter how you try to demonstrate that he picked a fight for no reason, he will justify his actions by inventing some offense he caught the person doing. Even though he has been known to stop in a discreet area with pretty much no one around to pee in a bush when he really had to go but couldn't find a bathroom, he tried to beat someone up when he caught them doing the same thing. All of a sudden, it became a "cause" for him to fight to the death over. He seems to love his tantrums so much that when he does them he has no qualms in doing so because he'll just apologize later and it starts sounding insincere after a while. Any thoughts or suggestions are greatly appreciated.