You usually have to choose between passing grades and being a mischief maker in high school. With this brilliant Lego contraption, created by NXTLOG member hknssn13, you can be both. It automatically grabs a sheet of paper from a stack, folds it into a paper aeroplane and then launches it towards your target.
Gizmodo AU Editor's Note: And, indeed, we covered it a little while ago. Here, have a picture of a cat instead.
Cat Image: ihasb33r