My all-time favorite is actually the first one I ever saw when I came to Lowpass, but I was never able to find it again. It had Cthulhu telling Jon that he could give Jon the ability to see into women's minds. Then he used it on Maura and heard...
Maura: "Fe^&5sdf g^*5235ng ng%98$)sa."
Jon: Uh, I still don't understand women.
Cthulhu: Did I ever say "understand?" Jeez, how much power do you think we dark masters have?
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"Only things I approve of should exist." -some guy on the internet