When you inform your parents, simply be really honest and keep the first statement as brief as possible. "Mom or Dad, I got a F on the test," for example, will suffice. The most important thing is that you are being honest with them. If you lie about getting a bad grade or breaking something when you actually didn't, then they have every right to be angry with you. As long as you're a good student and you try your best, then there's no reason why you can't succeed in life. Actually, now that I think about it, an F might even be a good thing. It will force you to work harder for the things you want in life. Now if you'll excuse me, I need to go find my principal so he doesn't kill me for giving an F to his son.