In this compilation of humorous mistakes it's mostly a bad day at work, and a very bad day for the owner of the equipment who will most likely have to foot the bill.
There's nothing like overestimating the capacity of your crane and having your load come crashing down to ruin your day. Or trying to haul a heavy vessel on a slight incline and finding out that the incline is just enough to make it tip.
And hoisting a show car to put on display and forgetting to set the parking brake doesn't make for a great day either.