Hmm, a good point, and I probably should clarify; not really an act so much as he's holding something in reserve, i.e. a mind that does simple, decent things, but in such a way that the complex repercussions of his actions are often ruthless but also basically for the common good (i.e. Ironcrust and the issue of unpaid taxes, off the top of my head). It's just really interesting to imagine what he could do with a mind like that, and why he doesn't...and still like him because he's often clueless re; Angua and thinks a Mister Potato Head disguise will make him unrecognizable.

As Casanunda is to the dwarves, so Carrot is to previous generations of Ankh-Morpork kings (finishing with Lorenzo)? All the intellect, decency, and general love of humanity had to come out somewhere, I guess...