If I was in charge of Big Brother, I'd build an identical house on the other side of the existing one.
Half way through the show, I'd do one of those "fake evictions" like last year. Two housemates would then go in to a circular room in the middle of the two identical houses. The other side of the identical house would be carefully made to look exactly like the one they'd just been in.
They'd then go into the circular room and sit down. Free drinks would be provided and the two housemates (preferably the two ditziest females) would get very drunk. While this was happening, the inside of the circular room would somehow very, very, very slowly revolve so when the two were asked to leave, they would enter the other empty side.
They'd then be left like that and would slowly turn into nervous wrecks wondering where everyone else has gone.