I did this a lot as a kid–especially if I was sitting around on the steps of a pool. I could put my hands and feet like I’ve shown in the first panel and convince my brain that my feet were my hands and vice versa. It would get pretty freaky if you kept imagining this long enough and also tried to do hand-like things with your feet–like picking things up–it can get kind of surreal. It’s like this veil slips away and you perceive your feet for what they really are.
Or maybe I just needed to get out more.