Another extreme teachers may veer into, in their desire to encourage discussion and thought, is simply to allow their students to drive the lesson's conversation. Admittedly, this extreme may also be the result of the teacher's lack of preparation. They don't know what to say, so they just ask their students to say what's on their mind.
Regardless, this point might sound contradictory to what has been suggested in this quarter's previous tips. If teaching is not about lecturing and we need to encourage discussion, doesn't that mean listening? Furthermore, isn't it true that the teacher often feels like they learn more from the lesson than are able to teach their students?
The problem comes in the extreme; the teacher should guide the discussion at the least. Ideally, the teacher should have good understanding of the biblical principles in question and be able to help students replace worldly concepts, faulty reasoning, or uninformed thinking with God's truth.

Everybody likes a good show, right? Another temptation we face as teachers is to put on a show to entertain our students. No, we might not call it such. But the intention is the same. How does this happen?
Sometimes, the teacher is trying to engage the curiosity of their students. So they launch off into a highly animated one-person skit. The class is entertained, but other than telling their friends what an enjoyable class they had this Sunday, are not prepared to live any differently. At other times, the teacher may be so animated by a certain topic that they put on a show, even unintentionally, expressing their frustration, disgust, etc. with the issue at hand. Again, the students may applaud the teacher for voicing their own irritation. But the end effect is a rant.
Passion in teaching is important; how can you use passion to reinforce the lesson, instead of replacing the lesson?