I have to admit I never gave it much thought until some woman I later deemed as crazy and probably troubled by an undiagnosed case of OCD did this as a topic for her presentation in our public speaking class. Though I suspect she had some serious issues, she did make a good point. Back in the day when toilet paper had printed designs on it, you could only see the entire print if you hung it with the loose end over the top. Additionally, I remember the house we grew up in had a TP holder that with a slight tug would spin perpetually until all of the toilet paper was on the floor. It would only do this if you hung the paper with the loose end under. So, with these considerations, I would say, over.
Source(s):
Source: Personal experience
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