Well trained doesn't mean fully under control.
It's an animal, not a friggin' file cabinet.
I love my dogs, but gotta agree there. I've been around dogs, training, and shows quite a bit. One example was while watching a dog off-leash drill team. Amazing to watch. One dog suddenly got too excited and jumped out of the ring and into the crowd, then ran back, jumped into the ring, and continued on. That dog was well-trained, and he recovered quickly from his error, but still, for a few seconds, he was out of control.