He (she? it?) says:
Unfogged: Comment on I'm Sure I'm Just Overly Touchy: You're not the first to have noticed the phenomenon, Carl Von C[lausewitz] wrote about it after seeing my department's ordering of two different kinds of pizza:
"Everything... is very simple, but the simplest thing is difficult. The difficulties accumulate and end by producing a kind of friction.... This tremendous friction... is everywhere in contact with chance, and brings about effects that cannot be measured, just because they are largely due to chance.... The good general must know friction in order to overcome it whenever possible, and in order not to expect a standard of achievement in his operations which this very friction makes impossible.
"Is there any lubricant that will reduce this abrasion? Only one... experience."