I made a thing based on stuff from inside my brain and it worked. First time!
Because my PC is remote (3-4 metres away) from my desk, it was a hassle (first world problem) to have to switch it on. So I decided to find something that would allow me to switch it on at my desk. After looking online for a ready-made solution, and not really finding anything (and not wanting to wait 2 months from Aliexpress), I decided to build it myself. $10 worth of components from Jaycar, 5 mins with a soldering iron, and I "prototyped" (check me out with my fancy skills!) my switch - a momentary switch mounted in a jiffy box, cabled to the power switch jumper on the motherboard. I was so stoked when it worked first time - such skills are not my forte, and normally things don't work like they do in my head, so I was thrilled when my brain and reality aligned.