Ha Ha,
Good one Danish, it goes both ways. I've seen Captains pull the speed brake in a 737 vnav decent, just to see the throttles go forward and the a/c nicely reduce the decent rate and recover back on vnav profile, much to the skippers bemusement. Everybody makes mistakes.
The problem is, F/O's (S/O's) such as myself, are very keen / desperate to learn. It is very difficult for right seat blokes to question certain things, (before the obvious start ranting, I mean non critical things, which can be checked later in the books etc for sop compliance) There are many perfectly acceptable "tricks", rules of thumb, or tips that thousands of F/O's learn from skippers which are great. The problem can be that if a Capt says its so, low houred guys question there own knowledge, especially during that flight. Dont get me wrong, I'm as thick as they come, ha ha, but mistakes and misunderstandings occur. As long as its safe, and its not the end of the world, use a nice bit of MCC/CRM straight from the book, and the guy/guyess in the other seat will love you for helping them correct their inadvertant mistake. Believe it or not, F/O's love flying with skippers who know there stuff.....
I'm a few shandies the wrong side of being chilled out, but were're all there to help each other, not to compete aren't we?