Maximum Overdrive. It has taken me until adulthood to get over the irrational fear that big machines like trucks will come alive and drive me over. For many, many years I always got a slightly uneasy feeling when I'm cycling and a big truck goes by (even though I live in a country with good bike infrastructure and bike on separated bike paths). Even now at 26 I occasionally get the feeling. It's silly, and I've mostly gotten over it. I guess my interest in cars and anything mechanical has helped me get over it, thankfully curiosity is sometimes strong than fear.
Funnily enough I occasionally listen to AC/DC and at some long ago point I stumbled upon their album "Who Made Who" and it became a favourite of mine. It was only a few years ago I realized that the album is the soundtrack to Maximum Overdrive!
Several years ago I actually bought a DVD copy of the movie; it's still wrapped in plastic to this day. It's not that I'm scared to see it, I just haven't gotten around to it yet, and by now I'm unsure where it even is any more.
Sorry, new?! Unless this is something different from what I’m imagining, thermostatic shower valves have pretty much been the standard in Denmark for all of my life. You can get them for 80 usd (or probably even lower). These are purely mechanical, no need for batteries. I can even find one on US Amazon for around 50 usd (https://www.amazon.com/Bathroom-Thermostatic-Showering-Temperature-Control/dp/B071ZP4ZHN/ref=ex_alt_wg_m?_encoding=UTF8&pd_rd_i=B071ZP4ZHN&psc=1&pd_rd_w=MLPp3&pf_rd_p=e06954f1-ab26-49e7-940f-21fea3d5decd&pf_rd_r=1YGK573NBS6VC329GYD0&pd_rd_wg=PC4iL&pd_rd_r=4415efd7-7117-45ad-8b60-0a1c86e84ef0&content-id=amzn1.sym.e06954f1-ab26-49e7-940f-21fea3d5decd).
Edit: I realise that this sounded more aggressive than it meant it to. I was simply quite surprised! :)