Why does every time someone sneezes it sounds like 'ashoe!'?

Swinbourne observes that deaf people don't make the "achoo!" sound when they sneeze, while hearing people seem to do it all the time - in fact, he put it in his humorous list, The Top 10 Annoying Habits of Hearing People. Nor is "achoo" universal - it's what English-speaking sneezers say. The French sneeze "atchoum"