I have dug up some interesting things over time. Some of this has been with a track hoe on the job.
Two of the best/worst things my friend (the one with the track hoe and the boss on the job) is the one who dug it up or hit it.
We were on a new condo project and the locates had been done. The spot he was digging was supposed to be clear. After a few minutes, he came over to me and the other worker with an odd look on his face. We asked what was up. He told us he had just dug up a fiber-optic trunk cable (on of those nice fat ones) and had ripped it up quite a bit.
Good for us they had mis-located it!
However, his all time best/worst one was when he was using a ride on chain trencher. This thing digs a 4" wide trench up to 2' deep. He hit a buried electric transmission line. It went off like an explosion. He yanked back on the control lever and dove off the machine. That was the only thing that ever damaged the super hard teeth on the machine.
He didn't know it at the time, but he had put an entire sub-station down killing the power for a large section of homes, businesses and data centers. In fact, the down sub-station made the news - though they didn't say what or who did it, just that a construction crew hit an underground cable. Again, this was a mis-locate. He was in the clear.
At least you did not have a live wire on your dig. And you are right, you never know what home owners do. That is why I always try to determine where a wire may be if I find a light or some other electrical device in the yard. (I helps when you have your own locator
)