The classic Yosemite scenario:
Euros fly in to LA, rent a car, load it up with groceries and gear for a week in the valley to do a bigwall. They drive up to camp 4 parking, arriving late at night. They throw down their bags in the woods, and wake up the next morning to the following series of events:
Bears have broken windows, ripped doors, and popped the trunk (or torn out back seat) to get to the food, which is gone with trash strewn about. Easy access to the gear finds the car pretty picked over by the valley rats, as well.
The rental car is destroyed, so a healthy towing fee is involved to get the vehicle out of the Park. Then the ranger shows up and writes tickets for littering and keeping food in the vehicle.
Vacation ruined.