Of course I love playing pinball but there is one thing i love the most is moment when you first buy or see a pin that you haven't played or seen since your teenage years or early 20's.
Those first few moments when you look over a playfield that you haven't seen in years.
 

+1, that is a great feeling. I still remember my first game, Time Warp from the fond memories of skipping classes to play pins. All the bits that were immediately familiar, all the bits I'd forgotten but soon recalled.