When you find yourself trying to remember a show (or any works) that's on the tip of your tongue but just out of reach, come here - the collective brain of the TVTropes community can probably help. Post all the details you can remember (examples help). If you're looking for a trope, head over to Trope Finder. Have general questions about tropes? Visit Ask The Tropers!
Irrisia
Since: May, 2009

European TV series from the late 90s.
I was around 6 or 8 so I don't remember much, but I think it revolved around a gang of friends who had a really creepy evil teacher, and every time a student misbehaved he would take them into a small room with a tv screen showing an animated green octopus waving it's arms.
The characters exposed to this became hypnotized and was never seen again. I really don't remember much more than that. It was subtitled, original language might have been German, but I had just begun to read so I didn't understand a lot.
I know it's a long shot, but I'd appreciate any guesses you might have.