Another 'old car' geezer pal and I were chatting about all our years of buying/owning and it evolved into how many spark plugs we could be changing if we added up all those old cars/motorcycles/boats/small engine stuff we own. It got to be a real laugh as we realized that it added up to a ridiculous number with a couple collectors rarely sell anything. Of course 'back when' in leaded fuel days we were changing plugs frequently in our V8 engined cars.