Recognition

I ran into a friend from high school that I haven't seen in about 5 years in the garden center today. His name is Dave. I recognized him instantly, but when we started talking and I was looking at him up close, it was like I didn't know him at all. I've found that before, even with people I know very well. It's like when you say a word too many times and you start to wonder if it's really a word after all, because it just sounds like sounds and syllables. At least that happens to me. Sometimes I have to go look up the word to make sure it exists. I did it yesterday, in fact, with the word "measure."
Maybe I'm just peculiar. Does this happen to you?