I got a parking fine in Antequera (about 7 years ago now)- I had parked, along with loads of other cars, behind the bullring early in the morning, where parking was permitted. I got back to the car and noticed a BIG ladder on the pavement, got in my car and drove off- I then noticed a parking ticket flapping under the wiper
I went back in the evening to look where I had parked and a man was going around putting up no parking signs as the fair ground stuff was due to arrive. The signs were not there when I parked, I would have noticed them, they were massive!
I went to the police station to pay the fine and said there was no signs up when I parked in the morning, nor when I picked up the car, but he just shrugged his shoulders. That was the last time I used the ´free´ parking on the street after that it was the underground parking or the pay to park (if there were spaces) from memory I paid around 35€ Not a huge amount, but I was mad as the sign was not there when I parked the car at 9am! I could not prove it though, so I put it down to experience and learned a lesson- not to expect free parking!!