Parents need to know that there is some "wanna take it outside?" bad-boy posturing and there are references to drinking and fighting. The cover art features a man smoking.
However, their style of singing isn't exactly for all people; like my little brother thinks they sound in pain when singing. I personally find the style a nice break from all the stuffy-nosed, flat singing that some bands use. Also, you have to listen to "You Probably Couldn't See The Lights But You Were Looking Straight At Me". Awesome song.