Learning about new kinks

So while I know that there are probably many kinks in existence that I simply have never heard of, I consider myself to be fairly experienced and open minded such that not much would surprise me. I might not find it personally interesting but hey! To each his own...

Anyways, last night I learned about the “Cleveland steamer” ?

And I was pretty damn shocked! Which leads me to two questions:

1. Have y’all heard about this?
2. What’s a kink that truly surprised you once you learned about it?