butterfly is an interactive autoloaded Lisp function in `
Use butterflies to flip the desired bit on the drive platter.
Open hands and let the delicate wings flap once. The disturbance
ripples outward, changing the flow of the eddy currents in the
upper atmosphere. These cause momentary pockets of higher-pressure
air to form, which act as lenses that deflect incoming cosmic rays,
focusing them to strike the drive platter and flip the desired bit.
You can type `M-x butterfly C-M-c' to run it. This is a permuted
variation of `C-x M-c M-butterfly' from url `http://xkcd.com/378/'.