Most places I've been people would nod and look at you with disdain. But I can't think of a person I've met that is as rigorous as this. (Courtesy of CodingHorror)
Testing seems to have less to do with technical proficiency (what gets you the initial result) and more to do with tenacity. I'm hoping it's like a muscle too - the more it is exercised, the more anal retentive I'll become about the lengths I go to check my work.