What would make a bottle of unopened fruit juice cordial fizz up in the cupboard and nearly explode?!

Question: The juice itself might have been unsanitarily processed, the juice might have started the fermentation process (was going bad) before packaging, there might have been an insignificant hole in the package, the bottle might have been dropped on the corner of the lid and it popped the seal, but not the lid (if the lid was plastic, it doesn't have one of those pop-up buttons like the metal ones do, so it could be open, but the seal might not have been broken).

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Answers: The juice itself might have been unsanitarily processed, the juice might have started the fermentation process (was going bad) before packaging, there might have been an insignificant hole in the package, the bottle might have been dropped on the corner of the lid and it popped the seal, but not the lid (if the lid was plastic, it doesn't have one of those pop-up buttons like the metal ones do, so it could be open, but the seal might not have been broken).

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How old is it? Was the seal compromised? Bottle cracked? Dropped previously?

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some time peaches can cause this. idk what it is but they like cause carbonation and explode

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Bulging and fizzing could be caused by bacteria which then causes fermentation and gases. Most likely came from the manufacturing plant. You should get a refund or a replacement - it's a bummer to miss out on your cordial.

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