Cell Phone + Magnet
I was playing around with some of my 1/8in. NeFeBr (or is it NeBrFe?) magnets leftover from the challenge. Was using them to find screws on my flip phone. I noticed that when I put it at the "joint" of the two halves, the screen went dark. Turns out it thought I shut my phone.
This was just a little odd tidbit that I wanted to share, that has potental. But, it isn't an instructable, so I just posted it.