Here’s a fun game to play while you’re on a plane that is beginning its descent: see how early – that is, how many minutes and seconds before the plane lands – that you can see a human being on the ground. And evidence of a human doing something doesn’t count; moving cars are a lot easier to see than an actual person out and about. This game can be played competitively or solo, where you try to beat your best time.
Generally, this can be played around the time the landing gear are lowered, because prior to that the plane is simply too high to see people. But be aware that this is surprisingly hard – I recommend looking in parking lots, or other areas where you an expect to see someone outdoors.