WyoWoman, to help you with your researches: I know of someone who's swallowed something the wrong way and fallen over in a heap for just seconds. This one is me.
We were sitting together with friends and I was eating a hot dog when someone made a joke. I started laughing and choked on a piece of rosted onion. I still remember I was giggling like hell and choking in the same moment, next I was lying sideways on the floor, having BRUISED MY HEAD on the table corner. Everyone was quiet and looked at me. I was quite amazed why there was noone laughing anymore. They told me "Roland, don't you do this no more, right?" They said I had started wobbling like mad and my face had turned dark-red, then I had sunk sideways to the floor, where I spend nearly a minute in spasms before I choked out the damned onion. Everyone had been so terrified they hadn't even moved.
the HIGH SUPREME RULER OF THE WORLD may be Mister WRONG PERSON FOR THE JOB himself but his story sounds completely all right by me.
Also there is nothing you can laugh about wich such incident. My hot dog was nearly uneaten when I dropped it on the floor. Shame for the waste.