Most everybody had made at least one bad, drunken decision in their lives. Called an ex at two in the morning. Or perhaps has a little too much to drink on a second date and wept inconsolably while revealing how simply damaged one was, while nonetheless retaining an uncommonly large capacity for love. That kind of thing was, while regrettable, at least comprehensible. But waking up with someone generationally inappropriate, like your grandfather's best buddy?