When someone is most of the time cheerful and happy, people around him tend to forget that this here is a person as well. There are times when he feels down. If it happens for an extended period of time, the person will slowly withdraw into his shell and not want to tell others about his feelings.
It's times like these when you need a special friend. Someone to pull you out of your shell. I'm glad that there are friends like that, and I am grateful to them too.
But I guess my shell is a bit tougher to crack.