I suspect this may happen to alot of people:
Me: Is this the right way to implement the feature?
Lecturer: yes that looks good
Me: *happy*
*Results come out*
Lecturer: *deducts marks for no reason*
Me: You said this is the right way of doing this...
Lecturer: I didn't quite see what you're trying to do
Me: it's fully commented.................
Lecturer: *confused as fuck* i will remark and get back to you
Me: *thinking* fucking retard playing with my grades like it's a joke.