It could have something to do with breaking a blood vessel from coughing so hard. I remember once in elementary school (and I note this is a long ass time ago), I attempted to lift a table with around 8 people on it. Well all I got was failure and a very, very SHARP pain... I don't need to say where because I'll giggle uncontrollably.. But I ended up finding out that I had busted a blood vessel from attempting to do something so hard. IMO.