How this form of interactive movie works

Every hundredth line is interactive and the lucky punter gets a payment for reading it off his or her mobile phone.
A voice modulator mixes the actor voice with the punters voice.
The problem of synchronisation is solved by echo links - in fact echo will differentiate the link.
At interval in the foyer bonus bond transactions will be available from screens featuring actors as tellers in company uniforms, out of character and costume.