I have a good friend who likes to call himself "slow poison". After I met him, I have thought about the idea of slow poison quite a few times. I can now say I have experienced such a thing at least twice in my life. But they're not negative as poison, they're very positive.
1. The movie Adaptation. I first saw the movie, and I didn't really like it much. Somehow I didn't want to accept that and told myself that it was an okay movie. But later, different scenes from the movie came to my mind every now and then, and I started liking those scenes. Bit by bit the movie grew on me, and a few days ago I saw the movie once over again. I am thinking I will see it again after some time.
2. My long bike ride, Pilgrimage 2010. As soon as I was back it was just another ride/vacation for me. Nothing remarkable. But every now and then I get a glimpse of how that trip has changed me. Then I called it a pilgrimage just for the kicks. But in retrospect, I think that was indeed a real pilgrimage. And this pilgrim wants more and more such pilgrimages in life!