Subject: Guess what?! [Teacher's name] is...
Hey [Friend's name],
You won't believe what's been happening in [Class name]! Remember how we were talking about [Teacher's name] and how [mention something you talked about previously]? Well, [tell your friend about the new development with the teacher]. It's been so [positive or negative adjective] and I just had to tell you about it!
For example, you could say:
* "You won't believe what's been happening in English! Remember how we were talking about Ms. Smith's weird way of explaining things? Well, she's started using these really cool visual aids and everything makes so much more sense now!"
* "You won't believe what's been happening in History! Remember how we were talking about how Mr. Jones never lets us talk? Well, he's started having these amazing debates in class and everyone gets to share their opinions!"
* "You won't believe what's been happening in Math! Remember how we were talking about how Mrs. Brown never gives us any breaks? Well, she's started letting us play this math game online during class and it's actually kind of fun!"
I know you're going to think it's [positive or negative adjective] too! We should totally catch up soon and talk about it more.
Talk to you soon,
[Your name]