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#14 You can turn your phone into a stealthy TV-B-Gone
This is one I can't wait to try out. Down here in Central Florida, if a TV is on and blaring in a doctor's office, restaurant, or other public place, it's either blaring a soap opera, some very-not-mainstream religious programming, or some very off-brand home shopping channel. Florida is a strange place.
Now, it can look like you're playing with your phone, but you can power off almost any TV. It might not be the most well-behaved use of your phone, but you'd be doing a public service.
Image courtesy TV Off.