"Everybody's an idiot except for me"
In my experience, nothing fosters that mindset quicker than driving (where, of course, it's always true...heh). Of course, it seems that sometimes people don't leave that mindset behind when they leave their car, which is a pity, because for everyday life it's really a terrible way to think. But I've exceeded my political quota for the day, so I'll leave it at that.