Found The Book But Lost The Irony

(I work at my local library as a library assistant.)

Patron: “I accidentally turned in a book that belongs to [Other Library].”

Me: “Sure, what’s the book title?”

Patron: “I Am Responsible.”

Me: *staring a patron in complete silence*

(I find the book, and the great irony is that it’s a child’s book.)

Me: “…Have a good day, ma’am.”

Patron: “Thanks. You, too.”