The added weight at the end of the shaft would make it much harder for the rake to do the twacking motion due to the significantly increased countermomentum. In fact, its much more likely you'd impale your foot on the teeth, than for the rakeshaft (and axe) to even touch your head.
Oh god I have a terrible obsession with that movie. For awhile, whenever I would get high all I would want to do would be to watch killer klowns. I watched it three times in one week last summer.
I'm a bit curious as to how that rake got from lying on the ground to standing so neatly against the wall...
Unless the person in the picture ran straight into it of course.