Same with folks who straight pipe their exhausts, or get the crappy sounding aftermarket exhausts. I hate it, but smile at both, knowing they're slowly going deaf.

For those who don't know how loud things are on a motorcycle (before adding in music loud enough to be heard over wind noise) even when in a full face helmet. That was just a decent quality blurb about it. There are better quality tests of sound levels inside helmets if you want to find them.