Florida Republican Sen. Marco Rubio's "water bottle" moment during his response to President Obama's State of the Union address has captured the attention of late-night talk show hosts this week, and CBS's David Letterman is no exception.

He unveiled his list Wednesday night of the top 10 things going through Rubio's mind at the moment he reached down for a drink of water during his address. Take number 9, for example: "Doctors say you should drink eight glasses of water every speech."