On PBS's documentary on Colgan and regional airlines ("Flying Cheap") they interviewed a Colgan FO who turned in his CA to the FAA for a Saab 340 flight in which the CA had turned some adult weights into children weights and penciled that in on the final load sheet in order to get a jumpseater on. Of course the FO was "okay with it" until after landing he discovered the numbers were fudged.
And here's a snipped of that letter to the FAA:
Look at how that is written. The FO straight up reported his CA to the FAA, with writing of the statement is true to the best of my knowledge under penalty of perjury.
Seriously, WhoTF does that?
And yeah, the FAA emergency revoked the CA's ATP for good, I believe his career was done for with this FO ratting out.