Ground loop - a warning to everyone using the ESC BEC

I've been meaning to make this video for a long time now.
Basically, if you're using the BEC on your ESC to power things, you need to cut the black wire to stop excessive current flowing through your flight controller, receiver and/or OSD.
I've done some measurements and (in nearly every case) the lowest line of resistance is the negative wire on the ESC's BEC. In normal use, it probably won't cause any problems but if anything happens to your ESC, all of the current might flow through the BEC and cause the magic smoke to be released.