If your BART ticket is denied at the turnstile, please don't think that you have the right to cut to the next turnstile over, in front of everyone else, and get your ticket denied yet again because there isn't enough amount left to get you through! You can try ALL the turnstiles and it still will not let you pass.
Please, do us all a favor, go back to the ticket machine and add the appropriate amount, and not frantically cut in front of everyone else lining up because you think it's the machine's fault, and not yours!
Just a tip. Thank you!