I can top this.
Last night we were walking out of the Hollywood Bowl with all the crowds, waiting for the light to change on our way to the remote lot.
These two guys (about 21 years old) walked by a police motorcycle, and one guy looked around adn tried to remove the helmet that was clasped to the handlebar.
He then walked on, cutting into the smaller remote lot.
But then he turned around, came back and actually removed it and started walking away with it, into the lot.
I walked to the intersection and found the police officer (who was a VERY big, buff dude) Told him a kid just swiped his helmet (to his disbelief). Another man and I quickly gave a detailed description of the guy and his friend and pointed the officer in the direction he went.
Considering all cars are stacked in the lot, they had nowhere to go, and only one exit.
Judging by what the guy did and the officer's reaction, I wouldn't want to be that guy when the officer found him.