I guess mine isn't on the same level as most of the ones I've seen in this post so far...
A former owner of my Indiana Jones tied *all* the GI circuits together to fix a burnt connector. Cut the wires a couple of inches from the plug and just crimped them all into just one big circuit. So the game only had two options for the lights, all on or all off.
Unfortunately, I didn't snap a before picture. I did snap a pic later for a friend that wanted to know how it was going. I was down to soldering the last wires to the new plug in this pic. I had to add a couple inches of new wire, I guess they cuts some of the original wiring off for some reason, it just did plug into the board before...