All week long we've been playing you this sound, and asking you to guess what exactly it is and where exactly in the Bay Area we recorded it.
MARK JOHNSTON: You can't only have one. They're like potato chips. You need more than that.
Congratulations to Robert, you're this week's winner!
For everyone else, check out our Facebook, Twitter and Tumblr pages for updates about next week's clue.
Is there a sound from your life that should be featured on Audiograph? Call at 415-264-7106 and tell us about the sound of where you live.
This auditory guessing game is part of Audiograph, a crowd-sourced collaborative radio project. Every Thursday, we reveal the origins of that week's sound on Crosscurrents.