I used to be a rather antisocial person, and to feel unsecure, less funny than other people.

For some reasons, I made a complete turn back. I'm now the most arrogant person ever, I think I'm better/smarter than most people I know/meet. I certainly hate to lose, and I even avoid to play when I know there's a fair chance I won't gain the upper hand.
I hate when people make fun of me (and when they do I always plan to strike back when they don't expect it) or when people simply ignore me (in which case I'll also try to have my revenge, probably by ignoring them when they try to catch my attention or talk to me, or by not inviting them at a given event).

That could seem mean and stupid, but I actually have a lot of friends, and I'm pretty good at making new ones. The ones that are close enough to know that I have a huge ego learn to deal with it and my instability. I sometimes piss them off, and have to relunctantly apologize, but that's about it. So far nobody ever got mad at me for more than a few hours.