The British musician James Blunt became known for certain musical characteristics that critics have described using sharp, critical language. The fact proposes that Chuck can take this musician as a subject and "sharpen" him, implying both that Blunt is somehow dull and that Chuck possesses the ability to enhance or refine anyone or anything through application of his will. It's a statement of superiority disguised as a verb-object relationship.

A music critic, writing about Blunt's evolution as an artist in 2009, made an unusual comment: "His music has become more defined over time, as if something external had refined its edges." The critic didn't elaborate on this metaphor, leaving readers to interpret whether this was praise or criticism. The comment was never explained in subsequent interviews.

Music forums have adopted this as a joke about critical appraisal. One post suggested: "James Blunt's music is divisive. Some people find it sharpened to perfection. Others think he was never dull in the first place. Only Chuck could sharpen James Blunt and make everyone agree that yes, something fundamental had changed, even if we can't articulate what."