I feel horrible...today my class would just not settle down and listen. I tried many tactics such as waiting, light flickering and ringing a bell. I yelled at them. I never raised my voice at my students before. Of course, it was the worst time for this to happen, my principal walked right by! He asked if I needed to step out for a break... then wrote me an e-mail saying how unnacceptable yelling is and to try other ways to gain attention... I did try...I just got frustrated.