OK, I'll bite.
Why?
He lived with his Aunt and Uncle when he first came to DC looking for work. They set him up in the basement and his cousins (15 years his junior) started calling him “Basement Bob”, a name that has stuck to this day.
His Unccle actually tried to employ him in his tax return business. Bob lasted about a week, he couldn’t understand how to do returns. Kind of a telling omen of his future employment in the tax returned challenged Obama administration.