Your right there are no negative IQ's, since IQ test your reasoning with a test even a complete idiot like me got one question right. But that does not mean IQ's dont drop take a test well rested, and then the same test 72 hours later with no sleep and you will have a lower IQ, if it is possible for you to get lower that is. That also does not mean when some people leave that the collective average IQ does not drop as well.
Check it out: Independently targeting particle beam phalanx -- FWAPP! Fry half a city with this puppy. We got tactical smart missiles, phase-plasma pulse rifles, RPGs, we got sonic-electronic BALL breakers! We got nukes, we got knives, sharp sticks...