I think the earbuds I usually walk around with (have to have music...always) would do the trick. Block out all the noise so I just hear loud music blasting in my ears instead
Not real smart. I used to know a dude that lost a few private parts doing stuff like that with model rocket engines. He's dead now.
What color is on the tips of those shots? Also, are any of them unspent (little firing pin dent on the bottom but unopened at the top)?