This is a reference to this comic
I drew a few years ago, which in and of itself is a reference to this moment
from the Season 4 Finale Bronies React. That's right baby, we're going 4 levels deep on this one!
It is now my headcanon that Twilight just uses the Hasbro Legal Dpt. as her personal hit-squad bogeymen on anyone she doesn't like.
More MLP comics and stuff!