Back in the cold war, it was hairier. There was the Russian sub that collided with a US destroyer. Damage was limited, the destroyer made it back to base under its own power, but it surely must have scared the bejabbers out of the US captain and crew.
Then there was that Chinese fighter that collided with a US recon aircraft back in the early uh-ohs. The Chinese pilot was buzzing the much slower recon plane, only he wasn't as hot a pilot as he thought he was. He was killed, and the US recon plane had to make an emergency landing in Chinese territory.