Begin by sketching a basic outline for the horse's body, but twist and curve the lines in an exaggerated manner to create a wacky appearance.
Add a disproportionate head, with large expressive eyes and an open mouth in an exaggerated laugh.
Give the horse a wild and messy mane, flying in all directions.
Draw the horse's legs at odd angles and tilt the body irregularly to enhance the sense of craziness.
Incorporate extravagant details, such as a clown hat or colorful accessories, to further emphasize its wackiness.