When in a parking lot brawl match, throw your opponent into the garbage truck and the door will open.From here go up to it and press the 'pick up wepon button'and you should end up picking up a shovel.Also if you head over in the corner of the orange truck and black car, throw your opponent into the black car and grapple him immediatly.You should see a cutscene involving the boogeyman in the back of the trunk.