Grandpa's Shoes

I was at my Grandparents house tonight, and my cousin Sami noticed my grandpa was wearing two different shoes.  Sami told grandpa and he looked down at his shoes and said, "no this is my pair of shoes", Sami told him again that they were different.  My grandpa responded with "I know my shoes, these are my favorite pair, I've had them for twenty years and I've been wearing them the past three days".  Sami again said, "no grandpa they're different".  So grandpa proceeded to take off his brown leather shoes and sure enough the inside of one of them said ecco and the other one said Allen Edmunds.  Pretty funny, he was sure that he had the same shoes on and took quite a bit of convincing to realize he didn't.