These are one-off random items - I'll spin them off into their own pages if they ever earn it.
I got a Casio Keyboard from a garage sale and just for the perverse fun of the challenge, I spent ages on-and-off figuring out how to get the backbeat and chord functions to work right. I made a recording of Track 5 from Lotus Test Drive 2 - The Dual, which is a DOS game.
I am proud of this stupid amateur thing because I am less musical than I'd like to be, so this is a real achievement for me.
(From 2007!)
Did you know that you can get a wireless spy-cam for $50? Analogue of course, and with a really limited range, but... awesome. Combine with a $10 remote control car (and a pipecleaner) and you have the spy equipment of your dreams ridicule. Watch the movie.
Slightly more awesome: combine the camera with a toy helicopter, and do a little Frankensteining to them both to make them play well together and off the same power source. Would have been much better if anyone had been able to fly the helicopter, and if it hadn't self-destructed shortly after (long but hilarious story). Watch the movie.