Boo's Crystal Ball
From the Super Mario Wiki
The Boo's Crystal Ball as seen from Mario Party 4.
Boo's Crystal Ball is an item featured in Mario Party 4. A player could use the item to summon a Boo to steal Coins or a Star from an opponent. Boo's Crystal Ball could be purchased at item shops or won in Mini Mini-games. The only reason why it replaced the Boo Bell from older Mario Party games is because it shows players their opponent getting robbed by the Boo [citation needed]. The player can stop the Boo from stealing a lot of coins by merely taping A rapidly, but their coins would still get stolen from the Boo.
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