The one I remember is going into London, as it was for us in Essex, on New Year's Eve in 1981. There were four of us and we'd had a few lagers on the way. One of my mates threw up in the Tube and then stood up and fell over in it. We thought it was the funniest thing we'd ever seen.
In recent decades this symbolic or metaphorical lyric has given way to one which leans toward metonymy.
The kind of issues that we face as detectives are similar to what the other married couples out there are facing, or the brother and sister, or the brother and brother are facing. Relationships are universal.