I did ... was the only Lab I had bad luck with. Her name was Hershey. Came from a my vet's litter of Labs. He would check in about her every few weeks and I used to tease him about the dog needing a brain transplant. My 3 boys were little at the time and we could not break her of the habit nipping at the boy's heels when they rode their bikes. The vet was over my place giving Hershey an immunization, when he saw her nipping the boys. He threw her in his truck and took her way saying, "No dog of mine is ever going to do that." He ended up giving her to an elderly couple with no grandkids who kept her chained when not on a leash. Some are like that. She also never had that characteristic "cock" to the head when you talked to her. Very unusual for the breed.
I think chocolates have the problem of small gene pool and the priority of color over content in their breeding. [ducking to avoid the possible shots to be fired by chocolate lovers]
My black lab pictured above, though is also a pure product of show breeders. He is [was, he is 13 years older and quite bent now] quite beautiful, but one of the lousiest retrievers you ever saw. He has been a good friend though. What he lacks in complex thought he more than makes up for in complete and utter honesty.