What is the most ridiculous reason a student has complained to you over a grade?

I'm curious of everyone's stories, but I have one that prompted this question. I've been grading papers all day, trying to meet my deadline for Monday. The assignment has a template so in my eyes, fairly simple.

I get to one student's paper. Overall thepaper was fine, but their Turnitin score was kind of high. I reviewed it and decided that I would grade it down a few points. Still an A paper, but they need to work on properly citing their resources. Less than an hour later, I get this email saying that they did properly cite because they have a reference page and wants to argue about their grade with screen shots. Obviously, having a reference page is one thing, but copy/pasting a direct quote without proper APA credit is another. I just chuckled because I can only imagine how upset they got over 5 points, when I could have knocked down more points because of the TII score alone.

What do you all think? Any similar stories?