Yes, that happened to me last Thursday!
I took Rex to the park, and there were a group of four or five youngs (about 17yo), playing with a rugby ball. When the ball fell on the ground, one of the youngs kicked it to Rex, out of reach, he kicked a second time. Rex took the ball and came running to me.
The young man came after Rex complaining that the dog didn't want give his ball back. I said: "He will not give back, he will kill the ball" while I tried, unsucessfull, take the ball from Rex.
His answer: If he damages my ball, I'll kill him. Rex "killed" the ball. At that moment all the other youngs had gathered together with us, and they wanted 50 Swiss Francs for the ball, on the spot, which I did not have. They said the ball costs 75 SF.
They also insulted Rex with all names, which I took very personal (they did not insult me directly).
I refused to pay anything. They called the police, which came, and yes, I had to pay the 50 SF for the damage on the ball.
It is paid.
What about you, have you experienced something similar, at one or at the another side?