Shoes

I was walking Sam to school today and sense he didn't PE, I let him wear his generic Vans slip-on shoes. While we were walking I heard a yell behind me. It was Sam yelling about his shoe falling off his foot (he has a bad habit of over-reacting to little things-don't know where he gets that from) well, I went back to help him put the shoe back on and as I was doing so he asked me why it had fallen off. I told him, "Because it's a slip-on shoe."
He asked, "Why do thay call it slip-on shoe?'
To which, I replied, "Because it just slips on your foot, it doesn't have any laces or straps."
Not entirely satisfied with my answer, he responded "Well, it's also a slip-off shoe."
How right you are, Sam. How right you are.