somewhat more readable than the compiled output

person.js

personUpdateSternness = (function() { 
  return ((this.laughter==0) ? this.sternness=true
                             : (this.laughter>5) ? this.sternness=null
                                                 : null),
         this.sternness;
}),

personUpdateLaughter = (function() {
  return (!this.sternness ? (this.laughter += 10)
                          : (--this.laughter,
                            ((this.laughter < -10) ? (this.laughter += 10000) 
                                                   : null))),
         this.sternness;
}),

person = (function(){
  return {laughter: 0, sternness: false,
          updateSternness: personUpdateSternness,
          updateLaughter: personUpdateLaughter};
}),

evan = person(),
ryan = person();