Well, the only one in our modern tech sector. There have been famous crashes in the past related to earlier technologies. The Panic of 1873 was caused by a railroad bubble, and arguably the Great Depression was at least partially due to a bubble from electrification and motorization.

And that popped too. Lots of people who spend good money on "buycatfoodonline.com" and pitched that part of it as the clever bit of the idea. Hey, I came up with the idea, all you have to do is write the site, that's easy isn't it?

No, as it turns out.

But it was fun while it lasted.