"Your Best Nightmare - Undertale" is a high quality rip of "Your Best Nightmare" from the game Undertale.

Jokes Edit

At 0:22, the rip turns into an arrangement of the "Super Mario Bros. theme" using samples of the instruments from the beginning of "Your Best Nightmare".

At 0:51, the rip transitions from the Super Mario Bros. theme to an arrangement of the song "Dancing in My Head" by Eric Turner and Avicii using instruments and sound effects found in Undertale.

From 2:57 to 3:47, the arrangement of "Dancing in My Head" is mashed up with the song "Your Best Friend" from the same game the advertised track is found in.