He was 100 percent right. I immediately grabbed a pair of cheap yellow foam earplugs (about 14 cents per pair) and rode home with them. It was quieter, but my Bluetooth communications system was too muffled and they were a little bulky in my ears. The next day I found a smaller pair of 3M E-A-R earplugs (about $5 per pair, cheaper in bulk) that look like mushrooms, with a yellow tip and blue handle to shove them in your ear canal. These fit better, blocked out more low-frequency noise than high, and were easy to get in and out of my ear with the little arm—I was sold.