I could see accidentally putting it in the fridge. I've done crazy stuff like that, put the milk in the cabinet and cereal in the fridge. Then the kids mistaking it for kool-aid. But an adult pouring 10 glasses and not noticing the label, the safety seal, the smell. . . .
Although, I've never made that mistake with chemicals. I don't even bring car related stuff in the house. That stuff says in the trunk of my car.