ABCD
How it Works

[[Two male characters stand at a blackboard. One is writing, in standard mathematical notation, that the integral of x squared equals pi. No differential or bounds are given for the integral.]]
Watching character: Wow, you suck at math.
[[Precisely the same scene, except the writer is female.]]
Watching character: Wow, girls suck at math.
{{Alt-text: It's pi plus C, of course.}}
It's pi plus C, of course.