That's funny. I had a similar experience.

I was recently treated for a stomach ulcer and they did an endoscopy to verify it, and it required me to be under sedation while they did it. They told me the sedation wasn't quite as drastic as general anesthesia, it was more like going to sleep on command. It also involved a drug that numbed my throat and made it less susceptible to the gag reflex.

After I woke up and was driven home, I got the world's worst case of hiccups. I felt like they were never going to stop. So I called the doctor's office and asked them what the hell was up, and whether or not they knew how to fix this terrible side effect that they had caused me to undergo. By the time I got finished explaining the problem, the hiccups were gone.