An air crash, a nightclub fire, Mike Royko and me — “Mom, what’s a curmudgeon?” asked 11-year-old me. I’m pretty sure I pronounced it “CARmudgeon” and I’m also pretty sure she didn’t correct me. This was long before smartphones and Google. “It’s kind of like a grumpy old man who just seems grumpy when, actually, he might be nice, underneath his…