Sam is a driver for Fed Ex. One day during his work shift, he realizes he forgot his phone at home and he leaves his route briefly to go retrieve it. He arrives home, picks up his phone and gets back in his truck. As he starts to move forward, he is also checking his phone for messages and is somewhat distracted. As a result, the Fed Ex Van rolls into the back of a brand new Corvette that had been parked in the street in front of him. Who is liable?