I did something even stupider than that!
I was putting in a patch panel between my "studio" room and the closet to the room adjacent to it so I could use that closet as a vocal booth. I had 2 panels, one for the wall on the studio side and one for the wall on the closet side. each panel had 2 XLR and 2 TRS connectors on them. I soldered 4 cables between the 2 panels......
BEFORE I routed the cable between the walls.