Which business idea do you think was so ridiculous that it feels absurd how much money it made?

I don’t mean this in a disrespectful way or anything like that, but throughout my life, I’ve come across (and I’m sure you have too) several products whose actual usefulness wasn’t exactly impressive, but their creators still made a huge amount of money.

For me, for example, it was:

• Fidget spinners (2017). At the peak, the global market was estimated at hundreds of millions to over $1 billion.

• Metaverse land (2021) – valuation could be for tens or even hundreds of thousands of dollars each, with the overall market reaching hundreds of millions during the peak hype cycle. I bought one too. :D (actually was scammed).

• Pet Rock (1975) – the creator became a millionaire within a few months.

Can you recall similar products (maybe new ones between 2020 and 2026) that were ridiculous but earned a lot of money?

P.S.: We, marketers, call these types of products "Fads."