Sam Bain, one of the creators of Peep Show, shared some of the inspiration for a scene in the show on Twitter.
And in response to a question from a fan, it then emerged that a character in that scene returned to the show.
So in the first ever episode of the series, when Mark has repeated run-ins with some local children, culminating in this genius insult...
It's the exact same character who turns up to burgle his flat five seasons later.
The actor is Sonny Muslim, also known for appearances in The Story of Tracy Beaker, and a number of other BBC shows.
He's, uh, changed quite a bit over the years.
Anyway, have a great day everyone!