Found this when randomly looking at orphaned blocks data.
Main Chain (miner unknown): https://blockchain.info/block-index/1021537/0000000000000000081ede271149c7405207d51845ffb6973dfe97952c15e19c
Orphan 1 (BitFury): https://blockchain.info/block-index/1021538/00000000000000000486299ff5b9c903531af986d9845b497b7d290bfc0192c0
Orphan 1 (BitFury): https://blockchain.info/block-index/1021539/000000000000000008a61a2f8e084d67b75f87df91ad9af6c27d962e0f62dfd2
Why would BitFury be work on two blocks of the same height? By doing so, if two are found, one of them would certainly be orphaned. In this case, both were.
Main Chain (miner unknown): https://blockchain.info/block-index/1021537/0000000000000000081ede271149c7405207d51845ffb6973dfe97952c15e19c
Orphan 1 (BitFury): https://blockchain.info/block-index/1021538/00000000000000000486299ff5b9c903531af986d9845b497b7d290bfc0192c0
Orphan 1 (BitFury): https://blockchain.info/block-index/1021539/000000000000000008a61a2f8e084d67b75f87df91ad9af6c27d962e0f62dfd2
Why would BitFury be work on two blocks of the same height? By doing so, if two are found, one of them would certainly be orphaned. In this case, both were.