The IT Crowd Etch a Sketch

I was shading this one all the ruddy day and it still came out like bloody rubbish! This was the most unruly, sloppy etch a sketch I have ever worked with! I was corresponding earlier today with fellow etch-a-sketchist, Pikajane ([link]) aka Princess Etch a Sketch about an etchannoyance she was having. She had mentioned how sometimes an etch will refuse to shade, it just spreads the dust around, leaving everything gray (SO FRUSTRATING). Well I was having the exact same problem, and this is what I ended up with. Far from my best work, but I'm gonna throw the old etch under the bus on this one, because this thing has no respect for etching skills...