My favorite books are the watch books and for some reason I find Detritus very interesting. I was re-reading The Fifth Elephant and I realized that the cold and extremely heavy snow in Bonk seems to have no positive effect on Detritus' intelligence. In fact, he appears as intellectually challenged as he does in Ankh Morpork, referring to "halberds" as "halibuts". How can this be when he gets so much smarter in the cold (even at night in the Klatchian desert). Why didn't he get smart in Bonk?