I hasten to add that I never actually did this, but the thought of it helped me at the time!
When I was 6 months pregnant, my car was vandalised by some @!!#% neighbours but I couldn't prove it to the police hence nothing was done. My plan was that when the baby was born, I'd save all the smelly nappies and in the dead of night post them through their letter box!
As I said, I didn't do anything but the thought of revenge was good!