Tell you what Sticks, if you DID meet them walking down the street, you could take a picture of them to spare us from posting up that flaming VAN again! Aaargh!
......As for me, in all honesty, I would probably decide not to bother them and just say something when I got level with them like:
'Lovely to see the two of you together'
..then I would just walk on, because, after all, I'm British!
If I met them in a pub, and I was 'quite tipsy' too, then it might be a different matter. I tend to be a little less inhibited then, so I would undoubtedly embarass myself by gushing all over them.
Poor things, no wonder they stay in and play