Question: how to make a paper airplane do a barrel roll?
Answer: Get a piece of copy paper. ... 
Fold the piece of paper hot dog way. ... 
Fold a corner the opposite way you folded the piece of paper in half. ... 
Fold the other corner the same way you folded it in step 3. ... 
Fold one of the corners again over top of the previous ones you folded so it looks like the picture above.