How does Bobby drive, but is unable to tie his shoes? This is the one thing that has perplexed me the most.

I would think tying your shoelaces would be much easier than handling a vehicle that weighs more than a ton on a crowded highway. Is Bobby some kind of savant?

For example, if I ask him the square root of 96,352,415, he'll immediately be able to spit out 9,815.9266. However, if I ask him how much his Snickers bar cost, he'll answer $500? Is Bobby some kind of Rainman? Is this the true reason Bobby has moved to Las Vegas, can he count cards like Dustin Hoffman?

Someone please help me understand this.