Significance
When hit in the head or jumped upon by a player, the Whacka produces a Whacka Bump, a special item that restores life and energy to the character and also can be sold for 100 coins.
Effects
The hits that produce the Whacka Bump cause considerable injury to the Whacka. If you hit the Whacka eight times, it will disappear. Once the Whacka disappears, the player will not be able to obtain more of its special items.
Fun Facts
The Whacka is named after the arcade game "Whack-a-Mole." In the "Super Paper Mario" world, Whacka Bumps also are considered to be edible pastries. You also can cook them, resulting in Roast Whacka Bumps, which possess healing powers.