What's the most obscure distro you can think of

Oh jeez. I forgot about that. I had that running on my DS back in the day from a GBA flashcart with a big-ass CompactFlash card sticking out the bottom. Good times.

Wow, I just realized it was the first Linux I ever used

Yes, particularly the variant distributed on a business-card sized CD rom. To be carried in your wallet for emergency use.