Welcome once again my little ponies! It is I Deinos, the mare of midnight with more of Ponyland's flora! Now you all know of the Everfree Forest with it's 'Spooky' trees my little ponies. Well, it was inspired by a much worse forest - The Shadow Forest. The trees weren't just 'spooky' they actively tried to kill you my little ponies! They generating spears to impale you with or just attempted to crush you to death.
In My Little Pony: The Movie a group of Ponies and Humans only make it through the Shadow Forest thanks to a Twinkle Eyed Unicorn named Fizzy's bravery as she breaks off and attracts the trees' fire so the others get away. After dodging the projectiles through skillful use of a teleportation spell she manages to barely escape herself.
Here is the segment from the movie featuring the Shadow Forest with the 'Giggle at the Ghosties' song from your FiM dubbed over it to highlight the contrast between G1 and the much lighter G4:
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