There's been so many surprises and twists over the years in BB and CBB it's time the producers looked back and recreate one or two. They've never done a secret eviction since BB5 when they snuck chicken stu out in his bare feet with his balloon bless haha but how good was that? the other HMs were playing hide and seek and just couldn't find him, brilliant! Also the tree of temptation from cbb7 - fantastic! Alex and the snowman and the other HMs watching through the window like WTF

BB5's Stu was actually evicted in the middle of the party. They called him into the Diary Room, like it was just a normal diary room call, and told him that he had the fewest public votes to win.

The hide and seek eviction I think you're referring to is during CBB3 when Lisa was the seeker and everyone else hid. When she had finished counting, BB told her that she was being evicted.

There were also two surprise evictions in BB9 when Mo and Kat were evicted.