Harry Potter author J.K. Rowling has quite the strong Twitter game. For example, she recently had a well publicized scrap with the Westboro Baptist Church over her support for gay marriage in Ireland:

Rowling’s response:

But the famous author is also known to mix it up with anyone who trolls her in her Twitter feed. Like this guy from this morning:

We’re not sure what prompted that, but Rowling’s response is perfect:

You sure about that? We might buy a greeting card like that! 🙂