"It takes longer than it takes"
- My Dad used to say this as he was well versed in Murphy's Law. He lead several large organizations during his career and saw it again and again. Now I have several people at work saying this. We use it mostly when managers try to oversimplify the complex technical solutions they don't fully understand (and then try to push for lower estimates and earlier release dates). I've known a lot of project managers in my day with fancy titles and certifications (PMP etc.), but very few of them ever practice what they have been taught. Most still try to do "right to left" scheduling (come up with the delivery date the customer wants and then try to make the estimates fit). If I had a $1 every time I was proven right after warning a PM they were playing with fire, I would have been able to afford a LJ Rubicon instead of a TJ X as my fun weekend car, LOL.