WTF HAPPENED TO MY CAR'S REAR BUMPER?!

This morning I walked to the parking to find 2 gigantic ass cracks on my car's rear bumper! I am sooooo mad! It didn't look like a car had hit it, and it didn't look like the crime of a key. I have no idea how it got there and now I have to pay for it! Words cannot describe how mad I am, because my dad gave me the responsibility for this car. Replacing it, both parts and labour should cost me a fortune again, FML.