Ive been here before?

You ever catch yourself doing something and You have no idea where the habit came from. For instance I noticed the other day that I drink with my pinkie extended. Obviously I've never been to an etiquette class doubt I've ever even been in the same sulfide as one. Wasn't raised to do so yet there it was. Never been a conscious thought of hey let's see how big of a pris I can be..as far as I can tell I've always done it so where did it come from? Maybe.... just maybe