Oscar: "To whoever made the microwave mess. The microwave is a shared kitchen appliance. By not cleaning it up, you are telling whoever follows "that their time is less valuable, as they will have to scrub out your disgusting splatter. Sincerely, disappointed."
Andy: That is just obnoxious.
Oscar: No kidding.
Pam: Wait, what? The mess or the note?
Oscar: The note. So holier than thou.
Angela: Hmm. I liked it.