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Expectation: I was deliberately trying to unlock the "Yogg Take the Wheel" achievement by stacking my deck with lots of removal / healing spells, and a few cards that enabled me to make copies of Yogg. The plan was just to keep playing this deck over and over until I eventually managed to [[Pyroblast]] my opponent to death.
Reality: My opponent was playing Res Priest. He played [[Archmage Vargoth]]. I [[Devolve]] it into [[Unlicensed Apothecary]] and kill it, polluting the res pool. A few turns later, he plays [[Catrina Muerte]]. The Apothecary gets revived. I play [[Yogg-Saron, Master of Fate]]. Fill the board with random minions. Opponent dies. Achievement unlocked.