Personal story about experiences with cables.

I bought a cable tester, I was building cables at the lengths I wanted - and just because I wanted one.

The surprise was when a couple of cables tested wrong. They weren't ones I built, either I purchased them or they were bundled. The screwiest one was pairing wires from different twisted pairs. It passed a simple, pin to pin, continuity check, but it wasn't wired correctly at all.