You play a few more notes, all low. They all sound bad. You try to go a bit higher, the buzz stops altogether, no sound comes out, and it hurts. You are first chair, but the guy on the end can do better than you now, and he plays with the mouthpiece over near his left earlobe. You play a few more notes and then try a higher one again.
Same thing happens, and it is starting to hurt .
You can feel the braces start to dig into the back of your chops. Try one more time. You put your horn back in the case, shut it, and go jump off a bridge. That is how it feels, but stop before you get to the bridge. Don't get discouraged.