2 of my 2 week old chicks have done this while I'm with them (who knows when I'm not there?) I figured that they might have a little bit of 'fluff' down their throats since they spend so much time preening. I put some chick feed in my hand and stuck it in the brooder, making sure the silent 'crowing' chick had access. That seemed to do the trick - although I also stuck around to make sure they took a drink and settled down.
It's probably like having a hair in your throat - not threatening, but uncomfortable. One person's opinion.
Good luck