I liked this:

"Seekers after the glitter of intelligence are misguided in trying to cast it in the base metal of computing." There is an amusing epilogue to this analogy: in fact, the alchemists were right. Lead can be converted into gold by a particle accelerator hurling appropriate beams at lead targets. The AI visionaries may be right in the same way, and they are likely to be wrong in the same way.

-Terry Winograd