Crossing the equator, it amazes me how many actually think there is a natural event or something that occurs at the exact crossing time. The most common misconception deals with the Coriolis force where some think that even the water draining out in their sink will start turning in the opposite direction at the moment the equator is crossed. Of course, King Neptune does actually come up from the deep to indoctrinate the pollywogs. LOL.
In my airline days, another life, I worked a while for Alaska Airlines. We had a great two day one night summer tour then called the Arctic Adventure Tour. It was really popular with visitors. We used Boeing 727-100s, left Anchorage in the morning, stopped briefly at Nome where we gave the tourists fancy parkas to wear for the next couple of days, then flew up to Kotzebue for a day of touring there, in the afternoon, back to Nome and their hotel, we would take them gold panning in Nome and out to watch the King Island dancers among other things before dinner then later in the evening. On the way between Nome and Kotzebue we crossed the Arctic Circle. We would make a big deal out of that and hand out certificates. The flight crew played along and built up the drama, when crossing they would rap the elevator and the aircraft would jump. Sometimes they got a little carried away. We never really made any money on it as it cost a lot to operate, we even built a deluxe hotel in Nome for the overnight stays. During the shoulder seasons we would squire lower 48 travel agent groups on the tour for free.
One time I was escorting a large group of those agents. The agent heading up that group was a nice guy and one I thought to be pretty astute. He and I were yakking up a storm about industry goings on and I wasn't paying any attention to the crossing, but he was. After crossing he asked me what causes that? Is there natural phenomena or something? I said to him, oh, you know, just a gimmick for tourists, like they do down south when crossing the equator. He screamed, "no, no", realizing he had been snookered.