It hits you. "It" - that faint feeling of consciousness. That's when you know you're truly alive. This feeling can come from any source. A happy event or a sad event. A promotion at your job or a death in the family. That's what is so amazing about life. It truly is unpredictable. One day you can have such a big smile on your face your jaw hurts. The next you may cry buckets of tears. And sometimes we don't even know why. Feelings of loneliness bring on feelings of deja vu. There's little people in your brain - "Hello, Mr. Paranoid, how can we help you today?" And I don't even know. A feeling is so complex. We have no algorithm for life, just live it as it goes by. Capture the feeling and keep it.