It's because it's the perfect font for expressing the inexpressible depths of his soul.
Bob's love affair with Comic Sans began in 2003, when he used it for his "I'm with stupid" bumper stickers.
Since then, he's used it for everything from his fantasy novels to his grocery lists.
Some say it's because he has an undiagnosed case of "Sans-phrenic Dysmorphia." Others say it's just because it's a great way to express his inner goofball.