Not me, I would have walked by butt up to the door and calmly told them their loved one is in the car and can't wake up. Simple and to the point. I wouldn't offer that he's drunk or anything else. Just a simple nudge to go get their loved one. Many times once they realize someone else has seen the situation, they will work hard to rectify it.

If they ignored me, then I would have called 911 after I snatched the keys. I don't play with drunk drivers. Nope, not when someone could be killed. If they hate me, oh well, deal with it.

I honestly don't like to get into someone else's business but when it would affect others in a negative way I will. I guess growing up with alcoholics tainted me.