SZ, this reminds my of a wonderful story told to me by some class-mates from university, working for Saab in the mid-eighties.
They had been buying a large amount of electrical resistors from this big Japanese manufacturer at a given +/- tolerance window. Upon the usual random checking of deliveries, the procurement dept at Saab discovered that they had been sent what looked pretty much like the two little "tails" of the normal-distribution-curve, while deliveries were still inside Saabs ordering tolerances.
Bloody wonderful if you ask me.