中国大学MOOC: Descriptive grammar refers to grammarian’s attempt to legislate what speakers’ grammatical rules should be, rather than what they are.

Which is a case of word play humor? A: The grammarian is very logical. He has a lot of comma sense. B: Back in high school I was really a good student. I mean, in all my five years, I passed almost all of my exams on the first try! C: The impeachment hearing of President Trump has been all over the papers. That sounds so serious, when you put these terms together: impeachment, hearing, president, Donald Trump...oh wait, I was wrong. D: Mr Bean(Rowan Atkinson)'s wordless antics!