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Brag about your accomplishments. Set extremely high standards. Criticize weakness. Be impenetrable. Be playful. Believe you are as good as you say you are. Find the one-up.
Arrogance is about projecting superiority in all things, and it's easier to be superior and to brag about it when it's about things you've actually done. When you score more points than anyone else on the team, when you get your work done the fastest, when you beat your brother in a footrace, make sure everyone knows about it.  Only brag about things that you do excellently. It's much more difficult to brag when you're only mediocre, and then your arrogance just comes off as ignorance. If you want to command presence, brag when you've got a reason. If you want to be more arrogant, you don't need to wait for an opening to brag, just start doing it. Arrogance is bullish and obvious, and arrogant people don't care if everyone knows it. Feel free to slightly embellish your accomplishments as well. It's better to exaggerate slightly than to flat-out lie, because you can get your arrogant bubble burst a little if people find out you didn't do as well as you claimed. If you want to come off as arrogant, start setting big goals and trying your best to live up to them. Your standard for excellence should always be higher than everyone else's, yet always within reach of your skills. Make the bar too high for anyone else to reach.  Let your standards evolve with your skills. The more you accomplish, the higher your standards should become. It's not enough to win one championship, you have to repeat and three-peat, you have to win MVP trophies, and be the best in the room. If someone offers a compliment, an arrogant person will sometimes respond with something like, "Oh, that's nothing. I'm not even trying." When other people fail to live up to the standards that you set for excellence and for yourself, point it out publicly. While it might seem cruel to point out other people's failures and inadequacies, it's an important way to position yourself on top of everyone else. That's just as important as bragging about yourself. You don't need to do it in a rude way to be arrogant, but it does help to be somewhat blunt. If your teammate or opponent in a game messes up a play, let them know that you disapprove, gently but firmly: "You know and I know that was a bad play. You just lost that for us. Pass me the ball next time." Eventually, you'll probably get into verbal altercations as an arrogant person. Other wannabe arrogant people will try to take you down a notch or two, and it's very important that you be rock-solid in your verbal jousting. Don't let insults or witty jokes get to you, and practice your quick comebacks to stay one-up on the competition. A lot of this will happen ahead of the game. Learn to identify your competition and keep them either on your side by befriending them and working together to dominate, or by knocking them down a few pegs before they get the chance to gain confidence and challenge you. Ideally, your arrogance should make you magnetic and attractive, especially to members of the opposite sex. A good sneer or a snicker at a ridiculous person or a ridiculous idea can be arrogant, but it can also be somewhat playful and charming. Think of the following playful arrogant icons:  David Letterman Chandler from Friends Barney from How I Met Your Mother Lady Gaga Ron Burgundy Terry Crews Oprah Winfrey Phil McGraw (Dr. Phil) Remind yourself that you are the best and take pride in every single thing you do. Really take this attitude on board in all of your thinking and dismiss the niggling doubts, should there be any. Know that you are amazing in every way, and let this confidence transform your words and actions.  In some cases, it might also help to invent slights or perceived insults that help to motivate you. Michael Jordan used to tape up disses from other players in his locker to help motivate him to dominate on the court. Come up with story lines for yourself to help give you something to work with. Position yourself as the underdog, even if you're the best in the room. Pretend that you're overcoming the odds, even if you're doing what you know you can do. Keep that fire lit. One of the easiest ways to come across as arrogant is in everyday conversations. When someone else tells a story, or lists an accomplishment, don't recognize it or congratulate them, just launch immediately into a related story of your own that's more impressive and spectacular.  Your friend just got back from a vacation at the beach? It should probably remind you of that one time you went snorkeling in Malaysia with local fishermen and lived on the beach in a grass hut. If you teach your friend how to do something, you can tell them that you learned how to do it in a few seconds (or however shorter than theirs might be). This will probably make them feel less superior and feel they can never do things as soon as you can.