Facial expressions are definitely pretty hard to make, when your face is pretty stuck to one thing unless you open your mouth or half close your eyes. Joker understands that well enough, and even utilizes some of it himself. After all, it's the most sensible thing to do when you live in the water with more creatures that don't emote than those who do.

"Well, hopefully ya have a lotta people ta chat with~." For a moment, he ponders diving under to surprise Julien on the other side, but thinks otherwise of it. Maybe in a little while. "Name's Joker, not one of a kind."