So many weird stories.
There is Alice In Wonderland of course. The golden standard for weird stories.
The Metamorphosis by Franz Kafka is about a man who turned into a giant cockroach.
Yellow Submarine film is a very memorable one.
Perfect Blue and Paprica are Satoshi Kon's work that I have watched and they give really weird vibes.
Many Western animation, good and bad, are weird: Gravity Falls, Uncle Grandpa, Adventure Time, The Ren and Stimpy Show, Infinity Train, etc.
Weird doesn't always means good though. In fact, the weirdest stuff are horrible and isn't always fun. Many are infamous. The Legend of the Titanic, Tentacolino, Where the Dead goes to Die, The Emoji Movie, etc.
And don't forget the horrible fanfictions. Fanfiction is filled weird and often horrible garbage. A lot of these stories takes the original into weird directions. Some are fun, most are boring, but ... Holly Shit!