oh it went down the wrong pipe really...your dead dude (jk) thats totally extremely normal and very really harmless...surprised you didn't know that...
I doubt anything will really go wrong, perhaps a coughing fit or something...
Or dying a horribly painful death from pneumonia. what would be even worse is if someone with SARS drank from your cup. what if someone with SARS drank from your cup, and you got pneumonia? You'll be dead within a week.