When you order an orange juice at a diner for your 4-year old son and when it comes he looks at it quizzically and asks, "Is this beer?"
When everytime you drop your 4 year old off at Kindy one of the teachers talks to you for at least 15 minutes about beer - then get's your wife to pass on a message to go to a specific bar to try his brother in laws first comercial beer! I got to frop some homebrew in for him and his BIL to try