STEPHEN FRY

I could have made this up, but does anyone remember a moment on TV where Stephen pulls Hugh of his piano seat and Hugh does his best Stan Laurel impression by pretending to cry? I've watched all four series of A Bit Of Fry And Laurie recently, and unless my concentration lapsed at some point, it's definitely not part of the series. And yet (I think) I remember it distinctly. Was it at some televised gig like Comic Relief maybe?
If it happened, I know I was young at the time, because I thought Hugh was really crying, which upset me X-D
I realise this isn't the most pressing of topics, but you know how it is when you feel sure something happened and yet you can't remember when or where.