"What's inside a tape, Mommy?"

Well, earlier this week, the girls found out what was inside a cassette tape.  So cool!  Unfortunately it was a Scripture Scout tape and fortunately it wasn't one of Kylie's favorites.  Who knows who started it (well I know who got it out of the tape deck), but when Kylie came running out of the bedroom saying, "Uh-oh Mommy, Look!" it was already too late.  There was 20 feet of the tape already out and a tear in it as well.  Since the tape was already ruined, I let the girls continue to play with it.  They had fun pulling it all out and then tangling (and untangling) themselves in the smooth tape.  Why is destruction so much fun?