For me, it was in 1966, when I was three years old, at the very first restaurant of it's kind: Ye Olde Pizza Joint, in Hayward, CA...I believe it's my earliest memory, and it twisted me for life. It featured a 3/13 Wurlitzer from the Warfield Theatre, San Francisco, and was the very first restaurant of it's kind, inspiring probably hundreds of such establishments all over the U.S.: only a handful remain, the closest of which is in Mesa, Arizona; not exactly convenient.
My dreams of organ playing would wait until 1979, when I was 14, and my parents had finally had enough of listening to me bugging them about getting an organ for the house. For Christmas that year, they bought me a small Conn spinet, which came with free group lessons. A year later, the teacher of the group told my parents, apparently, that I had some talent at this, and convinced them to trade up, which they did. This time, after much shopping around, they bought a Lowrey Celebration console organ, which introduced me to the man who would become my life-long friend and music teacher: a composer, jazz organist, and film-score fanatic named Chester Smith; he was making a living at the time selling home organs. He's still, after almost 30 years, my primary music teacher.
He didn't teach me organ, per se, and he still doesn't; he taught me orchestration, so I found myself gravitating naturally to theatre pipe organs, which are far superior for performing orchestral transcriptions, with their imitative orchestral stops, traps, and percussions, than their classical ancestors.
Here's a pic of my home practice and composing setup: Conn Model 652 Three-Manual Theatre, with KORG Triton Music Workstation on top...
Dean