Beer is never late. A beer doesn't get jealous when you grab another beer. Hangovers go away. Beer labels come off without a fight. When you go to a bar, you can always pick up a beer.
Beer never has a headache.
After you've had a beer, the bottle is still worth 5 cents. A beer won't get upset if you come home and have another beer. A beer goes down easy. You can have more than one beer in a night and not feel guilty. You can share a beer with your friends.