Frozen Soymilk

So I put a half gallon container of soymilk into my lovely refrigerator yesterday and I took it out today. I shook it like I always do but this time I heard this CLUNK CLUNK sound! I hastily twisted open the cap and peered inside...my soymilk FROZE OVERNIGHT! I checked my other juice containers and none of them were frozen like icicles >.<....is the freezing point of soymilk really high or something? Come on science peeps, help me. I can't eat cereal in the morning anymore...I gotta defrost it like frozen chicken now!

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