I was at MGC 2010 wandering through the pinball room when I stumbled upon MSF. The big DMD, atmospheric lighting, and unusual layout drew me in. Right from the start of game I found it to be a unique experience with being able to choose the score you want to listen to and then using the lever to launch the ball instead of a plunger.
I never triggered the Frankenstein toy in the half hour or so that I played the machine, but my interest in pinball was born that day nonetheless. This particular pin showed me that there is a lot of variation to pinball machines, whereas before I always was under the impression that they all followed a similar layout. For these reasons and many more I will eventually add it to my collection.
So how about the rest of you? What machine got you hooked?