Quotable nugget from the occasionally fun/occasionally tedious Terry Pratchett:

It was not anger AT anything. It was just pure, platonic anger from somewhere in the reptilian depths of the soul, a fountain of never-ending red-hot grudge; Mr. Tulip lived his life on that thin line most people occupy just before they haul off and hit someone repeatedly with a wrench. For Mr. Tulip, anger was the ground state of being."