I just make faces with mine, do stupid things, make a little dance and generally act stupid. I talk to them a little but never anything serious. Most days, other than my wife, they’re the only individual I get to share a laugh with in person.
Whatever you say or do … say hi to them for me.
Smiling is always good, especially at the start of the day when you first get up. If you don’t see any smiles all day, at least you’ll see one in the mirror.