You pretend to be friends with someone from whom you will want a favor.
You will tell everyone about your triumphs, but if they really were (triumphs) you wouldn't need to tell us about them.
You will find fault with others, who are JUST LIKE YOU.
You don't just think you're the sharpest tool in the shed. You think you're the ONLY tool.
You are always right, but you love to argue with anyone who thinks your wrong.
When you win an argument, you think it's because you have better ideas, but you don't. You are just the better debater, and you wear your opponents down with the weight of your bravado.
On the plus side, you will get ahead. But at what cost?