Good question. They can have a sense of humor, my cat will jump up on TV stand, sit in front of screen, blocking my view and look at me...she won't move until I get up then she runs away...next, she will hide behind my houseplant, wait for me to look at her then pretend to take a bite out of plant, she knows she is not allowed...I will swipe at her with fly-swatter and DOESNT intimidate, keeps biting plant as im beating her with fly-swatter saying STOP until I get up to remove her then she runs away,..I have a swinging mouse on string by the piano...she will walk up to it and swipe at it, it squeaks, then keep walking. She does it just for fun. She can smile, it's more of a grin. But laugh? No.