Try putting it very close to the side/back of the laptop and just leave it there. It won't work if you just point it, you have to leave it in very close proximity.

And I'd just like to emphasise erm... don't do this if you think it'll get you into trouble, and if it does get you into trouble I will accept no responsbility. Heh.

Also, it might not work anyway, but heck, it's fun trying.