Step 1: In pairs: look up youtube videos that explains how to fold a paper airplane
Step 2: Practice folding it and test it, which plane is the fastest?
Step 3: Prepare your own instruction on how to fold an airplane: write it down and decide who is going to explain what. During the instruction you are not allowed to read from the paper!
Next lesson: You are going to explain how to fold an airplane to your group, then we're going to do a contest who has instructed the fastest airplane