Step One: Give the speech while you are cleaning your guns.
Dropping a line like, "I don't mind going back to prison" would be effective.
I would not allow them to drive the car. You drive the car and then at whatever time they are finished go pick them up. If they call at 4 a.m. so be it. It is so much better to be a bit inconvenienced then to have them drive. I am not saying that either one would even drink, but you just never know who will be these days. Just do the driving. Otherwise I am sure that you raised a very nice daughter and she will be able to handle herself.
I agree with answer #1.
With the gun cleaning, you don't need the speech.
I'm one of the few folks you'll meet who actually did this. But it was my daughter's idea, not mine. She really wanted to go to the prom, or homecoming dance or whatever it was, but wasn't real sure about the upper class band beast (she was a lower class band beast at the time) who asked her. So... the rest is history, and so was the guy after that. But that night he was on his best, better than his best as it happens, behavior. :)
The look on his face...priceless.
I'd probably get thrown into jail today for such a stunt, at least in some jurisdictions, but that was 15 or so years ago, and in Texas.
Heeheheee
My Dad was "cleaning" all his guns when my sister's boyfriend came to ask if he could marry her.
I had never seen them all out before or since. I guess he liked my husband better. :)
LOL!
My father seriously did this before.
Worked like a charm!
Becki