Really, too many.
Other genius-level of strangeness? The Mighty Boosh, by Julian Barratt and Noel Fielding (radio, TV, theater). - Radio: https://www.youtube.com/watch?v=3OZN1zyS7gY&list=PLflSnz9gSh... ; also live shows are on YT. The core are the TV series though.
Logical genius to the extreme, madness revealing? People Like Us, by John Morton (arguably the best thing ever made for the radio). - https://www.youtube.com/watch?v=EjZ4mBz5Qcc&list=PLJPeS4Ugqq...