Well there was that time when Natsu singlehanded managed to destroy seven houses, level a historic clock tower, burn down a church, destroy parts of Lupinus Castle, collapsing the Nazuna ravine observatory and destroying half of Harujion harbor during one mission. But he always did have a habit of going over the top, me, I'm just acting as the Guild keeper at the time so I personally don't get in too much trouble with the council.
I'm going to have to look that up, never heard about it before.