My phone just got an update. It can recognize many gestures and physical actions as commands. Make 2 quick chopping motions with the phone in my hand and the bright light on the back turns on. Good luck in turning the blinding light off. Or, twist my wrist quickly, again while holding the phone and the camera comes up and turns on.
Baseball coaches and people in bars need to be cautious. Some of the elaborate gestures can be misinterpreted as insults or racial or sexual comments. I am not sure if there have been any instances of yoga or physical therapy accidentally turning on apps or recordings. More advanced moves might inadvertently purchase stock options or sell property while strengthening my thighs.
When my college wrestling team competed at Gallaudet University for the Deaf, we got quick demonstrations of the power of gestures and sign language. If you aren't used to reading gestures, and I wasn't, all sorts of communication can zip right over your head, without your noticing.
You may know that we are entering the iffy period of IoT, the internet of things. Your smart refrigerator may inform your car that you need to go to the grocery store. Your house system will tell the store you need milk and your car will put up to the online shopping dock to receive the order you didn't know you made. When you couple that with the area of communicative gestures, you get the possibilities of surprises and errors springing up. This doesn't even face the problem of updates and changes, not to mention what happens when your adult kids give you a phone from a different manufacturer than the one you are used to.
