Bookend

The Bookend is a haunted book which attacks the player in Super Mario 64 and its Nintendo DS remake.

Super Mario 64
Bookends only appear in Big Boo's Haunt. They are spawned from bookshelves when Mario approaches one. If Mario jumps or punches it, he will be rewarded a Blue Coin. If it attacks Mario, he will lose two health wedges and no reward will be received. It will also disappear if it hits anything.

Mario Party 8
Bookends are seen hovering in the background in King Boo's Haunted Hideaway.