On rare occasions

Would you please be kind enough to help me correct the paragraph. Thanks a lot!

I have the same-looking face as someone because I have a twin brother, who looks like me but differs in temperament. Because we have identical faces to each other, many classmates and teachers always mistake me for my twin brother. We are in different class and that causes some jokes or something funny to happen. For example, one day, a teacher asked my twin brother, Jack to do something that was assigned me to do. Jack was puzzled at first. After a while he sensed that the teacher mistook him for me, so he said to the teacher, “Excuse me, Sir. I’m afraid that you mistake me for Eric. Please look carefully. I’m Jack, not Eric.” Upon hearing that, the teacher promptly corrected himself and said, “Sorry, I make a mistake.” Things like this are heard on rare occasions.