Search: "wits about you" origin
Why: A friend refuses to lol at my jokes because he's trying to teach me a lesson.
Answer: The 1600s! except I don't think these uncited examples are from then:
- After the collision I had my wits about me and got his name and license number.
- Being followed was terrifying, but Kate kept her wits about her and got home safely.
The More You Know: Do you know what it means?
To remain alert and observant; be prepared for or equal to anything: to keep your wits about you in a crisis