Well....I think the target audience could be disturbed by it.
Either way it was quite funny. I thought that Crazy Twilight was a good way of showing her flaws as a perfectionist. "Clock is ticking Twilight. Clock is TICKING!" That creepy crooked smile and then the creepy evil smile were great.
I also saw the episode for Nightmare Night. It was funny but I did feel bad for Luna since she hadn't learned all the new customs. I think throwing her in another cameo is fine but not to the point that she's in more than, say 2, per season.
I wouldn't say I'm an under achiever, but I am supremely lazy