RANDU

"...its very name RANDU is enough to bring dismay into the eyes and stomachs of many computer scientists!"

"One of us recalls producing a 'random' plot with only 11 planes, and being told by his computer center's programming consultant that he had misused the random number generator: 'We guarantee that each number is random individually, but we don’t guarantee that more than one of them is random.' Figure that out."