This.
On one checkride, I observed a Pilot blow through the ILS on base to final. He had no idea how this could have happened. So I intervened, to let him know that he forgot to check that he had the right course dialed in and that this was a direct result of the the Pilot neglecting to check his gig on the downwind. This created an electric phenomenon, causing the aircraft's ILS to malfunction. It was a shame, the dude was a good Pilot, but I had to teach him a lesson. Unfortunately for him, he did this during a checkride so my hands were tied. The only man I ever saw cry during a debrief. The last that I heard, he transitioned to be a woman Pilot flying rubber dog shit out of Hong Kong.