Worst keying of my life was about two months after buying our first ever brand new car.
Wife and I walked out of the house to gather the kids from the front yard and go to Grandma's; on the car we find what looks like a smiley face on the drivers door and scratches all over both sides.
I'm pissed until we call the kids over, what we see is our barely walking daughter with a huge smile of pride and set of toy keys. You just can't be mad at something so cute
Your situation however would end much differently.