In the very beginning, when the song is just starting off with a tempo of the song is allegro and when the dynamic is piano, the shadow twins, Lacey and James decide to follow the old man. Soon, they follow him into his house.
BANG! Crash!!! BOOM!!!!
The tempo is still allegro and the dynamic is still piano. Now the shadow twins are checking on the old man to make sure he is asleep.
When the tempo is getting to vivace, and the dynamics are mezzo piano, the shadow twins, Lacey and James, decide they want to trash the old man's house.
Phew! It was only a bad dream.
When the dynamic is now forte and mezzo forte, and the tempo is vivace and presto, the shadow twins decide to go into the living room and make a big mess.
The tempo is still vivace and presto, and the dynamic is still forte and mezzo forte, the shadow twins are now throwing books and other objects in the old man's dining room. The music stops every time the old man dodges an item.
Finally, the song is doing a decrescendo and the old man wakes up, noticing that he was just having a bad dream.