I got the idea for this thread from this post by Scorpion49 in the CaseLabs club:
So what's you best/worst/funniest "wait a minute..."-moment during a build?
I'll start it off with my most recent moment:
A week ago I started making my very first scratch-built cable, a sata power cable for one of the drive cages in my CaseLabs M8. When I had completely finished the cable (sata connectors, sleeving, molex crimpon on and everything) I put the cage in the case. I had the cable pointing outwards instead of inwards toward the PSU