Shafting people boosts morale

It is a mind game.
Abuse your co-worker should be in subtle and different ways. To your peer, you should at least gain knowledge advance-or pretend you have-and pose yourself as a master or guru. To your boss, you should be more like a victim of his/her misbehaving. To contractors, do as you like. They are there for some reasons.
And watch your morale index rise.