This happened to me some time ago...
A guy came to my office for some small setting on his PS2 and while we were talking he asked me if any new Resident Evil game is coming out. I told him the next installment will be on PS3 next year. He said that he was the BIGGEST Resident Evil fan in the country, he kept saying that he played all games, bla bla bla... and continued babbling for around 15 min.
As I am a Resident Evil fan, I asked him "Did you like Resident Evil 4?"
He promptly replied "Oh my God! There's a Resident Evil 4?"
I answered "It came out almost 2 years ago!" >.<