Palladium is, in a word, ornery. While he has
no problem sitting on my shoulders, he also has no problem letting me know
when he's had enough social interaction for the day...by peeing on me.
He's done it so often, I'm beginning to think it amuses him. Thankfully, he seems
to have grown out of that stage. Mostly.
An interesting property of palladium is its
ability to store several hundred times its own mass in hydrogen.