If you give a kid your iPhone, she will ask you to use your camera. When you say okay, she will take dozens and dozens of pictures of other people's feet. Some will be her brother's feet.
Those feet will remind her of her feet and she will take dozens and dozens of pictures of her own feet.
Taking pictures of her own feet will remind her that she doesn't like wearing shoes and she will ask to take off her shoes. You will tell her no, but she will sit on the ground and take them off anyway. Your iPhone will be left laying in the dirt as you struggle to get the kids shoes back on.
Putting the shoes back on will remind the kid of feet and she will ask you to play with your iPhone.