How to make a paper airplane (ninja)

Grab your paper.

Fold the top left corner down along the side.

And now the right side.

It should look like this.

Fold down along the creases.

Unfold.

Flip over.

Here's what it should look like.

It should look like this.

Fold down this.

Flip over.

Do the same as step 12 for this side.

It should look like this.

Fold down, like so.

And now fold half of it back up.

Flip over.

Fold in half.

Fold down a wing.

Flip over.

Fold the other wing.

Here you go!