In a loud, crowded room you can't make out any single conversation, but let someone at a back table say your name and your ear locks onto it instantly. So your brain was listening to those conversations you thought you couldn't hear. How much are we constantly scanning without knowing it?

— the cocktail party effect, selective attention

Set the timer (5-30 min), take 20 seconds of prep if you like, start talking. Jot your thoughts onto the sticky-note board.