things that make you go....huh?

I was driving home from work tonight and I saw this woman pushing one of those jogging strollers. You know, the ones with the three wheels. She had her workout clothes on; her earbuds in. She was either ready to go or ready to go home. I looked over and there was absolutely nothing in the stroller. No baby, no kid, no water bottle even. Not sure what possesses someone to go for a walk or jog pushing a stroller with no one and nothing in it. Not sure what that was all about.