My complaint about the PG rating is similar to my complaint about brand-sep. It represents an arbitrary restriction. A limiting of options. The show could be rated TV-MA and still contain 99% PG content, it would just give them the freedom to do something more "adult" every once in awhile, IF doing so would really help that particular angle.
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SmartMuffin - Because anything less would be uncivilized - http://img.imgcake.com/smartmuffin/barkleyjpgde.jpg
http://dudewheresmyfreedom.com/