From The Nest – The Secret Squirrel

Quoting from the movie Alvin & The Chipmunks, Dave Seville talks about looking after Alvin, Simon and Theodore.

Mother in Store: [apologizing for her daughter hitting Dave on the head with a box while shopping in a grocery store] Oh, sorry about that. Sorry.
David Seville: Kids, huh?
Mother in Store: Yeah, they keep you on your toes. You have any?
David Seville: Three boys.
Mother in Store: Some days are better than others.
David Seville: …and then some days you just want to close them in a box, and leave the box in the park, and run away you know?
Mother in Store: [rushes off with her cart]

Who wrote this?