On the importance of grammar

I just about died laughing at this:

It is a truth universally acknowledged that it is only a short road that leads from grammatical laxity to cannibalism.

<idle musing>
Now, I'm not afraid to correct someone's grammar, but that is a bit too extreme even for me! Everyone knows it only leads to the collapse of civilization and the end of life as we know it! Cannibalism? Not that far...
</idle musing>

HT: Chris Spinks