Many of us are zombie fans and if you’re like me you probably played with LEGOs as a kid. I had buckets of the things, mostly bought at garage sales from rich kids, and I spent hours building huge castles and spaceships. I’d go on building sprees where I’d use every single piece I had or make as many different spaceships as I could. Or I would build sets to use with my other toys.

Even until recently, I had quite the LEGO Star Wars collection. I had the big Batmobile too. But I sold them when...