I found — when searching for something else — this page on the calculus of love. It’s actually really cute, and totally accurate mathematically. Both big plusses in my book.
The article analyzing these graphs is here. Definitely something to check out if you’re teaching precalculus or calculus.
Okay, it is 6:54 and I have to run to school for a 7:30 meeting! Yikes!
Lates.
Continuous Everywhere but Differentiable Nowhere 
Thanks for sharing this article. Too cute!
I love this!!! I will definitely be sharing it with my Calculus students this year. Thanks, Sam, for this gem! :)