Just put a gun on the table, as a background decoration! Just kidding, Tell him you will break his legs if he does not behave and I would not let him drive her to the prom. Don't they take Limo's?
I served in the infantry for thirty years, including Vietnam. If you do not have my daughter home by 10:00, I will kill your a--.
I took him at his word and had her home by 9:00.
Our daughter and her date are taking a stretch limo that they rented with 5 other couples. It's a big relief for us that none of those kids are driving. Besides, it will be like a big party for them. No alcohol is allowed in the limo.
On another note- Husband likes to invite the boyfriend(s) over when we castrate the bull calves. Leaves a lasting impression. Especially when the dog eats the 'nads in front of them!