no wait, it is explainable. The ups truck was going djing when the guy lost controll of it and drove it up a hill,the guy with the sewing machine is obvously going to the prom with a sewing machine.
the ups truck was obviously delivering him a wedding gift (aka the sewing machine) but once it saw his groom, and her beauty the driver was watching the road, and crashed, barely avpoiding the ravid currents below. its that simple.