Rewind Button was a twist in Big Brother 16 (US).
The Rewind Button, a gold button introduced in Big Brother 16 during Week 11, created a sense of mystery among the houseguests when they pressed it and triggered a timer on the screen. Unaware of the button's consequences, the houseguests anxiously awaited the timer's expiration. When the timer finally reached zero during that week's live eviction, the eviction process was abruptly stopped, and the entire week was rewound. This twist meant that the nominees were removed from the block, and the game reverted to its state at the beginning of the week, allowing the possibility for those who were on the block to potentially become the Head of Household.