This exercise involved writing a series of captions prior to realising that they were headed for single panel cartoons. Brunetti suggests you write something you heard in a public place, something you said earlier in the day, a catch phrase of slogan, a question of some sort etc etc. When these are set to one side you then draw the funniest thing you can think of, the saddest thing, something sexy, something abstract etc etc
Next job was to get the captions and the drawings together and mix them around until something... anything clicks. The point being that unexpected, surprising and great things happen when we combine words and pictures.
Dog and baby in the car is my fave.