Back when we were kids, "crazier-than-a-loon" meant a character jabbering to herself.
I've noticed that folks who live alone generally talk to themselves more or less all the time. Especially as they grow older.
Some of us get verbal with ourselves just to prove we're still alive. I know I'm alive but I like to sing. Even though I can barely carry a tune, it makes me happy'

But these days when you dress in Salvation Army looking sweats and an old shirt, carry a soiled grocery bag to recycle, and sing to yourself.
Believe me, no one at Wal Mart starts a conversation with you. In fact they may change direction mid asile when they hear you comming.

I notice some folks get pets for the sole reason of having a breathing something with whom they can converse. They know the white-coat boys with nets

would be hauling our octogenarians off right and left if it weren't for the dogs and cats. But I'm not up to taking a cat grocery shopping. I still

remember how it was with kids.