APAD: Every horse thinks its own pack is heaviest.

 Every horse thinks its own pack is heaviest.

We think that we work the hardest. This is also called responsibility bias: People tend to overvalue their own contributions and undervalue contributions of others.

Example: X: You’re questioning my contribution! I’m the one who has worked the hardest on this project. I haven’t taken a day’s leave in six months. Y: Every horse thinks its own pack heaviest.