As it would seem, the vast majority of people utilize the toilet paper that hangs over (coming in at 70%) with organized personality traits. The advantages to this “over” method seem clear compared with having the roll hang “under”. Whichever you choose, this is one of the preferences few people will hold against you.

Source: Original source – Over or Under: The Great Toilet Paper Debate

The Great Toilet Paper Debate  Over or Under  - 64