Veteran with 'Be Courteous With Fireworks' yard sign unaffected by Flowmaster exhaust, Toby Keith...

A local Army veteran has baffled prominent neuroscientists after they watched him “roll coal” in his lifted Flowmaster 10-outfitted 2004 Chevrolet Silverado while blaring Toby Keith’s “American Soldier” at 165 decibels and was completely unfazed by post-traumatic stress disorder, sources confirmed today.

Kyle Brainerd, who religiously posts yard signs asking to “Be courteous with your fireworks — combat veteran lives here” every summer and sports a Gadsden flag on his tailgate, has a unique condition that is only triggered by people lighting consumer fireworks on or around July 4th.