Hip Hop Skid Bikes / Hipster Sleds / HHSB

Yeah the headtube/rake is pretty crazy. And no, it's not a result of a serial crashing, It's just a odd frame.
It's a Szekeres, apparently a east german frame builder and by the size and look's of it it was made for a giant riding on really steep banked tracks..
If anyone have any ideas for the reason of the ht/rake i would really appreciate it.

It's all about the resulting trail. A measurement taken between the tire contact point and the intersection of the steering tube axis with the ground.
Generally speaking high HT angle + high rake = low trail = "fast" or "twitchy" steering.
This makes for an awesome handling experience and best suited for low speeds as it can get unstable at higher speeds where steering input is amplified.
This is why Triathlon/TT bikes, and MTB's have slacker HT angles and lower rake, to make them more stable.
Road bikes have a "mid-trail" which is a compromise between stability and handling, so do track bikes but with a steeper HT and lower rake.