"I knew the moment it happened, it was a miracle. I could have been kissing her when she threw up. It would have scarred me for life. I may never have recovered"

In this quote, M. Night Shyamalan is reviewing a minute of luck and fortune. He is grateful that he was not kissing his partner when she threw up, as it would have been a terrible experience that he may not have actually had the ability to recover from. He acknowledges that it was a miracle that he was not in that circumstance, which it was a minute of luck that he was able to avoid it. He is thankful for the minute of luck that he experienced, and is grateful that he was not in a scenario that might have scarred him for life. He is glad for the miracle that enabled him to avoid such a terrible experience.