Some cats like the taste of wine, squint at it and run after it. When they lick it, they will show an intoxicated expression. Some owners like the innocent look of cats when they are drunk, so they specially leave a cup for them to get drunk.
In fact, this is harmful to it. Cats shouldn't drink. Alcohol can even be said to be a deadly poison for cats. Cat's liver is different from human's, and it can't get rid of the toxins in alcohol. Therefore, if cats drink alcohol, it will lead to liver failure and even death.