My best wreck, by far, happened 7 years ago on my ceiling layout.
It's double-tracked, DCS, 100 ft. long. I run two consists on each mainline. Every other Friday, the poker group begins with a 3 hour happy hour. This time, I got blabby and forgot to start one of the trains on the outside line. A huge crash and falling boxcars resulted on the right side, near the bar. Fortunately, the engines are heavy enough to remain aloft. Five cars fell eight feet to the tiled concrete floor. Two cars were completely undamaged. Three were 1977 Lionel Famous American Railroad cars, with cheap plastic trucks. Remarkably, those cars also suffered no damage, but the trucks all shattered about the floor. I endured the required ridicule that night, ordered a bunch of metal trucks, and the rolling stock remains rolling.
Jerry