Cat humor
When I was about 13 my uncle Bill showed up with a stray cat, Bootsie, a beautiful slate gray male.After about a month of mutual hostility the cat and our dog, Daisy became friends and then constant companions and they would play tricks on each other Once when Daisy was asleep under the coffee table, boots, very stealthily jumped on the shelf above the dog and reached around the shelf and swatted the dogs ear, she jumped up and hit her head and the chase was on.
On another ocassion my father said that one day, while the cat was drinking water from his bowl, Daisy casualy walked up behind him and stepped on his head and took off running, the cat sat there sneezing and shaking his head trying to get the water out of his ears.
I have no doubt that animals have a sense of humor.