In a wristwatch imagine the battery is in the strap and there's a medical sensor in there connected to the internet. If someone is monitoring that they could phone up if the user has forgotten to take some medication. This could save hundreds of dollars in medical fees later. What's missing? It's a stable battery.
I worked at an ice cream parlor called Chadwicks. We wore old-timey outfits and had to bang a drum play a kazoo and sing 'Happy Birthday' to people while giving them free birthday sundaes. Lots of ice cream scooping and $1 tips.