If you're waiting in line at the post office, for example, give him a book to page through or make funny faces at him instead of handing him his pacifier. (babycenter.com)
Lift your shoulders off the ground for the crunch, smile and make a funny face for baby, wait for the response, then return to starting position. (fitbodyhq.com)
He also wants to entertain you and his siblings by making funny faces. (babycenter.com)