From my “Murphy’s Law” desk calendar archives thanks to Aunt Evelyn, Uncle Pipey, and cousin Nancy:
Robert’s Axiom: Only errors exist.
Berman’s Corollary to Robert’s Axiom: One man’s error is another man’s data.
Goofy guy’s corollary to Berman’s corollary to Robert’s Axiom: There are a lot of other men using my errors as their data.