What are your favorite "fun" apps?

Yesterday @fmerian recommended Googly Eyes from @Sindre Sorhus, which I immediately downloaded! After enjoying the eyes following my cursor around for the day, that got me thinking - what other fun, goofy apps do you all have for your Mac, Chrome, or other devices that don't necessarily serve a purpose other than to bring joy and break the monotony? @Scroll Buddy is another one that comes to mind that I have saved in a collection.

We see productivity apps, AI-based software, open-source products, etc. all the time, but what about your saved products someone made after their 9-5 or on a weekend just to have fun and test their skills?

Share your favorites and why you love 'em!