Do you like orange juice?
When they tell us that expired things cannot be consumed, they mean it, and here we have a clear example. A bottle of orange juice has been colonized by a yeast colony growing inside of it and feeding on the natural sugar of the juice of the fruit.
Luckily, the house owner noticed this before putting someone was at risk. Serious health problems in terms of the digestive tract and stomach aches may have been caused. Honestly, we do not wish this to anyone, not even our worst enemy.