Moms' do not know everything, very evident in the first two books. Well, for the third book it was concluded: Dads too or at least for Greg who was forced to engaged in "macho" activities his father had involved him.
Half-hearted, Greg thought it was best to just obediently follow as told so as not to get into more trouble. Apparently, things went beyond expectations again. More trouble happened and in the end this one last shot of trouble also saved him from the biggest deal he had to face: Military Academy. Is he really just clever? Or forces of nature just gives him a little bit of luck, sometimes?