I really want to test this
For a few years I've been aware of this website that purports to be able to unlock shopping cart wheels using the speaker on your phone, but i finally had an excuse to try and and i remembered in the moment.A woman was outside the grocery store struggling to move her shopping car that was stuck because two of the wheels were locked
I remembered the website! So I put my phone near the wheels and played the sound. The wheels unlocked like magic. She was very happy. So cool.