I just realized something…
I think I know what the “mayonnaise” part is referencing in the words that Unicorns consider to be jinxie: “Magic”, “wing”, “feather”. “mayonnaise”.
Back in 2006 the “Robot Chicken” show’s episode came out, with the scene where they say the following: “If you polish a unicorn horn long enough, it gives you magical unicorn mayonnaise.”
(That even inspired bronies to create a tag on derpibooru with the term “magical unicorn mayonnaise”, back in 2013.)
This really doesn’t look like a coincidence… I think the writers of the movie made the clear reference to that, which only adults would understand. XD
