This is pretty random but I spent the last 4 hours while out walking dogs, picking pebbles and leaves out of my socks & shoes.  The lesson learned is: socks (footies) that loose the elastic around the ankle make it very easy for pebbles, leaves, dirt, etc to get into the socks and then rub up against your foot.  It is annoying.  My favorite pair of socks (which is actually not my favorite pair after today) are now in the trash.