Rovo has my favorite example of AI misfeature. Just checked, it's still there in Cloud Confluence. In Edit mode for a page, you can select a range of text and a menu will pop up, with Ask Rovo being a drop down on it. There's a few good options... Improve Formatting, translation options, Make Shorter...
... but it also has Make Longer. Yes, a built-in feature to type some text in, and the use the mighty power of AI to bloat it.
Naturally, you can repeat this process several times on the same text, for your own little personal demonstration of what model collapse looks like in real time.