Pokemon cards. Crypto. NFTS (not anymore though). Something a famous person once touched (this one kind of existed in the past with things like saints and holy figures using something, but now it's transcended religion and it's everything anyone of note used). Something a famous person simply recommended. Meme stocks of companies that have no real product to back them up. Toilet paper. Hand sanitizer. Mugs.
Beanie Babies were mocked for being a clearly worthless thing that gen x went wild over and it all collapsed overnight. Now millennials are turning everything into Beanie Babies, and despite plenty of people thinking the "everything investment" bubble will pop, it just keeps growing forever and expanding into more areas of life.
I've been thinking "the bubble is going to pop" for years (decades?) now. But it seems to have not only not popped, it's accelerating.