my youngest was 18 on Thursday
She went out for a meal with some friends, which went ok until some of them gave her a 3 pint glass as a present 
and then they filled it with a mix of various drinks and she drank it
So at 1.30 she was brought home feeling quite ill , and continued feeling quite ill ( into the loo or a bucket) until 4.00
apparently she is never going to drink again 