My group was the last one finishing the lab report for today's physics lab. The instructor asked why I didn't try more data point after I turned in the report. (The manual doesn't require a specific number of data point) I said I didn't really have enough time. He responded sarcastically, "Do you need to take 20 mins to get 10 more data points? This is the most ridiculous thing I have ever heard!" I was a little bit angry at that time but I didn't know what I could say. I think it is pretty meaningless to argue whether I was "capable" to take 10 more data points. I just wanted to get it done and leave at that time. I have to admit the entire report was a little bit messy and I got wrong answers for 2 out of 10 questions, which I guess was part of the reason why he had such response. I just want to know if anyone has faced similar situation like this and how did you keep yourself happy and maintain a good relation with the professor.