The setting is a baseball field, the game is over and the players are celebrating victory. They cheer loudly and drink. Then it happens. One of the guy lips curls up past his nose, his eyes cross and his whole face appears much smaller. What happened you wonder? It can only be classified as a "bitter beer face".
Then the other guy players get bitter beer faced.
Even the dog gets it. Then some other guy comes and saves the day with a good old Keystone Light.
Even though it's fun to watch the ad, you might want to take a look at the drinks that give the players those famous contorted faces. They are labeled "Bitter Beer". If they all dread a "bitter beer face" next time they might want to look at the label of the drink. I know it's just so hard to notice.