I wasn't there, but...

I imagine the conversation went like this:

Passenger: "Is this cab taken?"
Driver: "Nope, hop on in."
Passenger furtively looks around, then, "This is a stick-up! Give me your wallet!"
Driver: "I have a better idea. You give me your wallet."
Passenger: "Is that a gun?"
Driver: "Yep."
Passenger:"Here is my wallet." hands it over.
Driver rolls up windows and locks doors.
Passenger pulls out cell phone, dials up police. Oops, now he is going to jail for attempted robbery. Apparently his complaint about being robbed held less water than the cabbies claim that the passenger started it...But at least he waited by the cab until the police showed up....