[Wasted]

Give each housemate the same secret mission, then Big Brother gathers all the housemates and tells them that one housemate has been given a secret mission, and that if their mission is discovered then they are evicted. What they don't know is, that they think they're the only person on a secret mission when in fact, everyone has a secret mission. But the first person to be caught out will be evicted. As a group on Friday, the housemates decide on one person who they think is on a secret mission, and that person is evicted.