Simply minding one's own business is more offensive than being intrusive. Without ever saying a word one can make a person feel less-than.

There are two circumstances that lead to arrogance: one is when you're wrong and you can't face it; the other is when you're right and nobody else can face it.

Nothing frustrates people more than a cocky guy who's still winning.

Nothing amuses people more than a cocky guy who starts losing.