A trillion years ago when I was a wee tot I had a mug with a little mouse in it who would pop his head out to say hello when I was about half done with my cocoa. I'm glad to see that there is a classy adult version now that I'm an ancient lady.
On the bus in the morning I really don't want to talk to anyone. If I see an acquaintance I'll leave my headphones on and nod a friendly hello and keep to myself. This kitty has got the right idea. A nice little wave but no conversation before coffee.