Ask HN: Weird, curious or bizzarre subreddits that you would like to suggest

Sometimes I like to rediscover the good old days of the Internet, and I think I can find some of the frontier spirit on reddit (or maybe other communities like 4chan?).

What are the subreddit (or other forum) that you sometimes follow and that you would like to suggest to the HN community?

They can also be super niche but not necessarily inherent to technology or computer science.

(sorry for my english)