This little vinyl magnet came in a sheet of "Simpsons"-themed refrigerator stickies I found at the Target Dollar spot. Of course you can read how it says "Now it's Marge's time to shine!", right? This weak little flexible magnet is actually just powerful enough to trip the reed switch.
The little penciled cross slightly more visible on the machine's trackpad indicates the approximate location of the reed switch. This machine still has the original display attached, but it's been skinned... for a project I'm undoubtedly never going to finish.