From the Super Mario Wiki, the Mario encyclopedia
Bell is a souvenir in WarioWare: Twisted! found in the Instruments folder. It features a photorealistic bell held by a disembodied hand on a blank, white background. The bell can be rung by tilting the console, which produces a chiming sound and a colorful musical note to accompany it. The noisiness of the sound depends on how quickly the console is tilted: turning it slowly produces a soft chime, while turning it quickly produces a loud chime. If the console is quickly turned without stopping, the bell flies out of its user's hand, leaving them with the handle. No sound can be produced after that, though if the souvenir is left and reentered, the bell is restored.