I now realize after four years of having this same lock screen photo that just seeing it triggered the "Happy" thoughts and neurons that linked to all the times I watched the video or showed it to friends -- every day, all the time, without actually watching it. I'll still keep it the same - there's no better photo I want to see regularly, and I still play it in my head - but now I notice there's this new message firing of something like "Apple broke sad" when I pick up my phone and see the still image. It's funny how the mind works.