#370451
Mon, 27th May '13 2:06:16 PM
from riding the wave
So they crack the Fourth Wall long enough to wink at the audience, but never actually break it.
I like to imagine that Pinkie is aware of the Fourth Wall, but she swore an oath not to tell anypony else about it. She's part of a super-secret task force, safeguarding Equestria from metafictional threats.
Of course, I came up with this headcanon before "Magic Duel", and the ending of that would imply that Twilight also knows about the Fourth Wall. I guess that was an accident on Twi's part: she wanted to help Pinkie get her mouth back and teleported herself to Pinkie... and wound up behind the Iris Out because Pinkie was there. The credits started just before Pinkie said something along the lines of "Twilight, what are you doing back here?" or "Wow, Twilight, you can see the audience too? This is going to be so fun!"
I suppose it's a good thing Twi learned of the fourth wall then, because she would have learned anyway in "Magical Mystery Cure". Alicoronation was enough of a shock without also throwing the fourth wall reveal at her.