I'd give Orange's orange Jack-O-Lantern a special award for an idea whose
time had come; however, with no visible teeth, my mind imagined the northern
hemisphere hinging away from the southern revealing a wide mouth, filled
with long, sharp, needle-like teeth-scary!!!

I think there were some recent (within the last twenty years) movie monsters with this type dental hardware. Does anyone remenber it. Critters! maybe?