'Tight Pants' with Jimmy Fallon, Will Ferrell & Christina Aguilera.

Dog sledding without the sled.

Scary peek-a-boo teddy bear may haunt you for life.

Sorry - Justin Bieber (Cover by Ten Second Songs) using 20 different music styles.

Goat absolutely loves Doritos.

Cute dog named Maymo falls in love with a giant stuffed gorilla.