Any joke for my class opener?

Teacher announced that “students, we will have only half a day of school in this morning.

All the students said “Yeahh”

Then the teacher said “We will have the other half this afternoon”!

Explanation:

That would make me smile. But try to think of what the topic will be and then make something silly out of it.. but appropriate. If you talking about the benefits of a healthy diet you could say something along the lines of, "what did the green grape say to the purple grape... *make sure to pause for dramatics*... BREATH!" Ha, just make a cheesy and they'll love it. :)

what has 4 wheels and flies?

Explanation:

a garbage

truck

what are the terms?

answer; /// the answer to the above question is (true);