I enjoyed reading about the Northwest Pinball & Arcade Show, and not just a because of my interest in retro technology. 
I was particularly intrigued by a company listed in the Show Sponsors section. When I saw the logo for PinballBulbs, the lightbulb above my own head lit-up. I was reminded of the rallying cry for sales and marketing people to Find a need and fill it.
Seriously? A company that exists to sell lightbulbs for pinball machines? A bit of investigation confirmed that they specialize in lights and lighting upgrades for pinball machines!
Sharing What You Know
Light bulbs for pinball machines? That’s an awfully narrow niche, but apparently there’s a need for them. I suspect the proprietors didn’t start with a brainstorming session and end up with an inspiration to sell a very specific product into a very specialized market. They were probably already involved with pinball machines and saw the need to replace or upgrade the many light bulbs they contain.