I just had a student email me, complaining about getting 25/50 on an assignment that they brushed off and half-assed: the diagnostic essay. Said they thought that was there to give them an idea of how I graded, rather than there to give me an idea of where their strengths and weaknesses were. Whining about how they didn't want to start the semester with a 67%.
Well, kiddo, let this be a lesson to you: don't half-ass assignments. Any assignments. And definitely don't complain to the teacher that they called you on it, lest you tempt someone to drop your grade by ten points, or so.
Because I'm tempted. They're so lucky I'm a better, fairer, less vindictive teacher than that.