A plug-and-play computer mouse, given away for free or a pittance, that slowly moves itself and the pointer towards selected advertisements, "buy now" buttons and the like.
Like other types of spam, eventually somebody clicks.
A device-driver could do the deed by itself (even on a non-trick rodent), but the ouija board thing is more effective.-- FlyingToaster, May 20 2015 I miss-read this as Abattoir Mouse..... shudders.-- xenzag, May 21 2015 Well, that would certain.y meat the specification -- 8th of 7, May 21 2015 random, halfbakery