I once shaped the hell out of serendipity and when it happened it was with mixed feelings. Was exciting, but partly underwhelming as it didn't turn out how I imagined, but to be honest I felt like I had hacked the system. Focusing too much on the conditions for the occasion to occur, even though so many factors outside my control when into it happening, I still feel I shaped it too much. 

Intentional serendipity is different than actual serendipity. The former is a plan and front of your mind, the other is magic and back of mind.