14 and season 18) and HouseGuests competed in a series of competitions for survival in the house, and the HouseGuest who finished last may face automatic eviction; if the competition is played as a team, all the members from the losing team are eligible for eviction as if they are nominated. An Eviction Competition was also proposed as a twist in the premiere of season 19, but was not held as the majority opted for an eviction vote instead of a competition. About halfway through the game, the evicted HouseGuests become members of the Big Brother Jury, which play a role to vote for the winner of the series between the final two HouseGuests. The members of the Jury are not shown any Diary Room interviews or any footage that may include strategy or details regarding nominations. In seasons 2 and 3, all HouseGuests who were evicted except those who either walked or removed from the game are not eligible, but due to a possibility of a tie and an American public vote is decisive, the jury is only eligible for only the seven recently evicted HouseGuests beginning season four (known as Jury of Seven), before increasing to nine members (Jury of Nine) starting season 15. Once only two HouseGuests remain, the members of the Jury would cast the votes to decide the winner by placing their keys with the name to the slots (versus stating their choice to eliminate, as in all other votes). Members who either walked or removed but was part of the Jury remained as a member but is not allowed to vote, instead the vote is decided by the public, as it was first seen in season 11 where Chima Simone was removed from the game while she was still part of the jury and host Chen Moonves represented her vote in her behalf. To keep the series intriguing, each season typically features a new twist to change the format of the game. This began with season three and the famous "Expect the Unexpected" twist. Other seasons feature smaller twists that have a smaller impact on the game, usually affecting that sole week. The most notable example of this is Pandora's Box, a twist that originated in season 11. The twist sees the current Head of Household for that week being tempted by the box, and can choose to either open the box or leave