mine started about 12 years ago..i was 16 and i dreamed of having an arcade machine in my house.  of course i was in high school, made about $40/week and lived with my parents..so i had to settle for my TV sitting on top of my clothes dresser.  I pulled the top drawer out a little, put a board on top of it, and sat my SNES arcade stick on it and played Mortal Kombat 2 for hours.    
Jump ahead about 8 years, i was reading a game review online and i stumbled across a review of the x-arcade joystick.  About a week later, i bought a two player x-arcade stick and all of the console adapters.  I really wanted it for playing fighting games on my ps2, dreamcast, and xbox.  After some serious Soul Calibur 2 sessions with my friends...i eventually put the x-arcade back in it's box and didn't use it a whole lot for a while.  
Jump ahead a few years, My girlfriend and I decide to move in together...we end up renting a house with a finished basement...so naturally i hooked up my game consoles and set it up as a theater room with my DLP projector.  then one day i am browsing the internet, just wasting time and i decided to play around with MAME.  i had used it many times before, but only with a keyboard, or usb gamepad.  then i remembered my x-arcade unit that was just sitting in the attic collecting dust.  i quickly hooked it up, fired up some Mortal Kombat and was hooked.  after about an hour, i had managed to piece together a MAME pc out of parts i had lying around and set it up in the basement.  i put the monitor on the bar and put the controller on a little stand that i had.  and it was then that i realized that the dream i had of owning my own arcade machine could finally be a reality.   I told my girlfriend what i was planning on doing, and she wasn't real thrilled.  anyway, one day while she was at work, i called around and found an empty cabinet for $20.  i went and picked it up..it had a coin door, marquee light, 3 buttons and a trackball in it.  
i think she was a bit suprised when i told her i bought it, but she was OK with it.  about a month later i asked her to marry me and now she is my wife.  she would get annoyed sometimes when i was workign on it alot, but she understood that it was my hobby and it made me very happy.  This was before we had any children.  I often talked about a second cabinet but she always told me that one was enough.  Well, I finished it up shortly before our son was born...and i named it Zak-Man after our son, Zakary.  I wasn't thinking about it at the time, but that was the smartest thing i could have done.  We are planning on having at least one more child sometime in the next 2 years.  So naturally if i have an arcade machine named after one child, i can't not have one named after the other child.  So even though I have to wait a while, i will get my second cabinet eventually.