This month's joke is based on two meanings of the word, horn.
horn - A hard, pointed, often curved part that grows from the top of the head of some animals like cows, goats and rhinos. In the cartoon, the cow has two horns on its head.
"The bullfighter was almost hit by the bull's horns."
horn - A device that makes a loud warning sound e.g. a car-horn.
"There was a dog sitting in the road. I had to blow my horn to make it move away."
