Shaking hands
This is awesome but I wonder if they have problems with people giving them food.
https://soranews24.com/2013/07/26/we-go-to-shake-hands-with-an-otter-its-like-that-scene-in-e-t-but-way-cuter/
Looks like it was a one time event 12 years ago and you had to make an appointment.
aww. that makes me sad as I was hoping something like this could be common.