John has drunken 2-3 full strength beers and is driving his friend home from the party. He is over the driving limit while under the influence of alcohol. He could cause an accident.
Call someone that is able to drive and isnt under the influence of alcohol. Ask if they are able to drive the two of you home. Ask them if they are able to move your car to a safe place for you to come and pick up when you are not under the influence.
John and his friend are driven home safely without risking a car accident. John's parents' car is safe and hasn't been left in a random spot.
John has decided to drink 2-3 full strength beers. He is 17 so he is still under the legal age for drinking alcohol. This could affect the growing brain and block the neurotransmissions within the brain.
Before going to the party John can ring the party host and ask if there will be alcohol at the party. If there is alcohol at the party tell the host that you won't be able to make it.
John is at home and sober and hasn't been influenced by the effects of drinking alcohol under age. This will have no negative effect on his brain and keep him mentally healthy.