The Bridle of Frankenstag
"The Bridle of Frankenstag" is a play that's been performed at Ponyville theater. It's a sequel of Frankenstag, though it's unknown if it's based off another book by Marey Spelley or not. The play was described as being "frightful" by Rarity, but Rainbow Dash considered it pretty cool, especially liking the scene where Frankenstag's monster smashed an entire village. Arguably, the play had the biggest affect on Spike, who was left scared and paranoid after watching it, even hiding in Twilight Sparkle's hair-styled in the manner of the titular character's own mane-to get away from the terror of it all.