Neal Stephenson: Snow Crash

They have a new species here too: people with antennas coming out of their heads. The antennas look like the ones on cop walkie-talkies: short, blunt, black rubber whips. They rise up from behind the ear. The first time she sees one of these people, she figures it must be some kind of new Walkman, and she wants to ask the guy where he got it, what he's listening to. But he's a strange guy, stranger than all of the others, with a permanent thousand-yard stare and a bad case of the mumbles, and he ends up giving her the creeps so bad that she just shoves an extra-large dose of stew in his face and hurries him on down the line.