Locale: Haunted Kingdom
The local boss of the level, Koopula was once a normal Koopa troopa until he sold his ability to reach the after life for wealth. The end result was that when he died, he became a vampire confined to his mansion.
His boss fight involves fighting him in the lobby of his former mansion. To fight, capture a Sadamura. Then the Sadamura must stare at Koopula to make him freeze in fear. Then Mario, as the sadamura, climbs up and ground pounds Koopula. repeat thrice.