A pun is a joke that plays with the different meanings of a word or with words that sound alike but have different meanings. Puns are often used to make people laugh or think about how words can be tricky. In the video, the person wants to hit the can with water from a garden hose. He says, “Ready? Watch this. I am going to hit the can.” But instead of hitting the can, the hose is set to the “mist” setting. The water comes out as a mist (a light spray) instead of a strong stream to hit the can.