I had thought I knew how to pronounce pinyin "c," like the English "ts" in "cats." But on a trip to Shanxi it seemed like most of my friends were pronouncing it like pinyin "ch." Village names ending in pinyin "cun" seemed to be pronounced as if they had "chun." Chinese "蔬菜" (shucai) seemed to be pronounced "shuchai."
Was it just my bad ears?