The title of the programme is a double entendre. Referring to a toilet U-bend, the cel-animated opening titles began with the camera being flushed down a toilet and ending up in a sewer (for the first series' opening titles, a live-action boy also sat at his kitchen table waiting for his copy of the "Round the Bend!" comic to be delivered, and when his mother grabbed it after it came through the letterbox just before he could, he mouthed something that made the comic give her an electric shock and forced her to drop it, and the view then changed to the now-fully-animated shot of the comic's front cover). It was also a popular saying at the time to describe someone who was insane.