Anyone who’s watched A Bit Of Fry & Laurie will recognise this, from one of their brilliant runs of vox pops.
This one in particular is from episode three of the first series.
As is this one.
But hello, there’s Stephen, dressed in character at the back there.
This was probably planned, as a little in-joke, but a moment later it’s revealed he’s carrying coffees.
So I’m going to choose to believe that he accidentally walked in to shot, before or after they shot his side, and took a moment to be in character.
The trouble with this theory is that, in the very next episode, this happens.
And seems to cut away just as Stephen is about to speak.