From my “Murphy’s Law” desk calendar archives thanks to Aunt Evelyn, Uncle Pipey, and cousin Nancy:

Wethern’s Law of Suspended Judgement: Assumption is the mother of all screw-ups.

 Goofy guy’s reflection on Wethern’s Law of Suspended Judgement: i have witnessed and even contributed to many assumptions, and by golly, they were all mothers of screw-ups.