Are they real? Just an urban legend? A secret govt. research project? Where evolution will eventually take swinging? A common household product on more advanced planets? Something you should keep out of reach of young children? THE best name for the next Star Wars movie EVER?!!? A residual effect of the questionable mushrooms Ms. EVIL put in the pasta last night? 
Sometimes when you are dealing with super secret government projects, it's best not to know too much, Mr Evil....or ask too many questions.
Isn't consolidation what swinging is REALLY all about? 