Title text:
People looking for the gaps in our understanding where the meaning of consciousness or free will might hide often turn to quantum uncertainty or infinite cosmologies, as if we don't have breathtakingly complex emergent phenomena right there in our freezers.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3144/
Also, even if it does nucleate, it only freezes if enough heat is removed from it to allow for the phase change to occur.