That's a fun twist

... on "Thank you."

When gratitude is warranted but not proffered.

don't waste time

"Never be bashful about ending the meeting early."
- Chris Sacca

etiquette

"Even if it's 'no', always respond."
- Deputy White House Chief of Staff Alyssa Mastromonaco

Image source here.

"When you have nothing to say, say nothing."
- Sting

Korean etiquette

"Never pour your own beer."