When could you see the difference?

I have had two people this week tell me that they did not know who I was when they first saw me until I started talking. These are people I have known for years. I can't see the difference except that my clothes hang off me. In the mirror I look the same.

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.