From my experience in riding busses, this wouldn't happen. Either you pay or present a pass/ticket, or the driver waves the fare, or you're simply told to get off of the bus. I've never seen a case where you can 'ride now and pay later.' The closest to it is when people get on and take a moment to get their money/pass from their pocket and typically move further into the bus to make room for other passengers who are boarding, which is a prime opportunity to just take a seat and hope the driver forgets you haven't paid yet.
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