Attitudes spring to mind, right off the bat. I can live without bad attitudes. I deal with them every day, from start to finish. Moody teenagers are the worst. Cut that crap and let's do something productive here. If your body is here, you may as well get something done. If you aren't going to work, if you're just going to sit there and brood, you may as well have stayed home and done us all a favor. I'm trying to help you, but I need you to meet me halfway. I really just want to say to some of these kids, "You're not the first and you certainly won't be the last." There's always someone worse off than you. Set your ego, your pride, and your "image" aside and let's make something useful of yourself and prepare for your future. Some of these kids are so caught up in God knows what, they're pissing away their opportunities later on, when it comes to college. Do well now and have multiple options to choose from, rather than a couple.
I try to live my life by the philosophy that you CHOOSE your attitude. I really wish some of my students would embrace it as well.