<human>: Condense the text into a few key points

Last night was the final night of a fair our city does once a year. Huge event locally. Walking the 10 blocks to the spot to watch the fireworks I see this older pick up with its headlights on. I look around and see no one. There were no houses around. I decide I had get my chance to be good guy and do something nice for these people. Checking again that there was no one, I open the old trucks door, reach in and turn the lights off, lock the door, and shut it. After searching my pockets for a receipt, I start to leave a note for the owner when I hear a voice behind me asking me to step over to them for a word. The cop says he saw me reach in the truck after looking around and then start messing with stuff in my pockets. After explaining the situation to him he decided to let me go with a warning. In retrospect, I can see how shady it looked and how I would react if I saw it, so I can't be too upset at the result.
<bot>: Tried to be a GGG and shut headlights off for someone and get mistaken for a thief by a cop walking by.