I can't tell you how many times I was sitting down eating some fried chicken and doing a little texting and realized quickly how greasy my little iPhone's screen got in no time.
You have just been to the grocery store and you have a double arm full of groceries in your hands. You approach your front door only to realize that you are now going to have to set your double arm load of provisions on the wet dirty ground while you fish your keys out of your pocket...