You have 'Tourette Syndrome' and its a syndrome where you do or say things out of control and it suddenly happens for no reason. For example you can do some tics, hiccups, twitching, or even cursing for no reason. Its just that you cant control it.

One time you were sitting in class normally when suddenly you cursed loudly and its obviously your syndrome again, but when you realized that you cursed so loud you immediatly covered your mouth in shock and all your classmates looked at you surprised that you have the audacity to just curse loudly like that not knowing its your syndrome.

Well, everyone even the teachers know that you have Tourette Syndrome but they thought this was a real curse coming from you and not your syndrome so the teacher turned to look at you with anger at what you said.

Teacher - "Leave my class! NOW!"

And then your bully, Keith, started laughing at you.