[HiImBrian]

The robber called the limo driver because he said his brother was going to prom. Since it is prom season this makes sence. He told the driver that his mom who supposably worked at the bank, had a bag with his clothes in it. what I think is wierd is that the limo driver didn't question why the guy was getting picked up so close to the bank and why he couldnt get the "clothes" himself