Colin saw the Dumper/Dumpee dichotomy on a bell curve.
John Green -- An Abundance of Katherines
The cover sheet plotted a rough-looking bell curve of speed solutions, and below it was the noise prediction curve.
Tom Clancy -- The Hunt for Red October
He drew a bell curve on his office pad, suggesting that Brett’s somnambulism would reach a peak, hold for a while, then begin to taper off.
Stephen King -- Cujo
Hence the bell curve: The majority of people fall somewhere close to the vertical dividing line with the occasional statistical outlier (e.g., me) representing a tiny percentage of overall individuals.