About ten years ago, I was on a Royal Air Maroc flight from Marrakech to Casablanca. It was extremely foggy with zero visibility on approach. We were about to touch down and I could just make out the runway below (not more than 10 meters) when the pilot applied full thrust and aborted. It felt like we didn't gain any altitude for a few seconds as I could still see the runway below. We finally gained altitude and flew back to Marrakech. After we landed, the captain announced that due to the zero visibility and miscommunication with the tower, he was about to touchdown more than halfway along the runway in Casablanca (which would have led to overrun) and aborted. Definitely a white knuckle moment.