Seems crunchy peanut butter lovers are more optimistic than their creamy peanut butter counterparts. A survey commissioned by Jif found that 63% of those who prefer crunchy peanut butter describe themselves as optimists, compared to 56% of those who prefer creamy peanut butter. Crunchy peanut butter fans are also more extroverted and more likely to be night owls. Creamy peanut butter fans tended to be early birds and more introverted. (SWNS)