https://news.ycombinator.com/item?id=46334725

TL;DR

Camera makes it look more than it is, it's mostly just sag

If you want to see electrical with significant zig zag, open up the wall of a house that was built without very detailed plans, but still hired an electrician with a lot of prior experience being told to move stuff after the fact. They just zig zag it like crazy under the drywall, so there's an incredible amount of slack to pull wire to new and exciting unplanned locations.

Very interesting, thanks!