Your Best Nightmare

"“Golly, if only you had DETERMINATION to fall back on! BUT YOU WERE JUST TOO STUPID TO USE IT!” - Flowey’s exclusive line for the musical"Your Best Nightmare is one of the songs in Undertale: the Musical.

Video
The following elements are present in this song, in order of appearance:
 * An epilepsy warning appears before the fake intro (where the monster is replaced with a Loox)
 * Instead of showing Flowey’s SAVE File (LV 9999, play time 9999:99), the intro fades into Flowey crashing into Frisk’s own
 * The word “REAL” in “I’ll show them all the REAL meaning of this world.” is replaced with “TRUE”. Additionally, the word “over” in “I’ll SAVE over your own death.” is replaced with “and reload”.
 * When Flowey says “Hee hee hee... You really ARE an idiot.” a piece of artwork is shown depicting multiple copies of Flowey surrounding Frisk
 * After the line “Toodle-oo, kiddo! DIE!” file 2 loads, revealing the first error of the video: the blue SOUL is shown on the WARNING icon instead of the cyan one
 * The infinite looping “HA’s” are taken directly from the GAME OVER screen
 * Another piece of artwork is shown after the orange SOUL, in which Frisk is shown falling from Photoshop Flowey to normal Flowey, followed by a sped-up part of phase 2, before file 2 loads again
 * Animated artwork showing Flowey’s attacks not used in-game, however, the mouth laser still appears
 * The second error is present when Flowey’s DF drops to 0 when Your Best Nightmare is still playing
 * Flowey’s troll face’s text (“You IDIOT.”) is covered up by an overlay of Photoshop Flowey’s mouth
 * A portion of ASGORE plays mid-Finale
 * The third error is present when Flowey is still attacked when he is supposed to have been defeated beforehand by the human SOULS
 * Near the end of the video, one can slightly notice that “No... NO! This can’t be happening!” has not been covered up