Make sure it's not too general, please!
I love seeing movies where an apartment/house previously seen as inhabited turns out to look completely different without the implication of someone freshly moving out or be completely abadonned for too long to had looked like this at the time of previous insepction.
Movie I know of where it has happened
They Cloned Tyrone had this happen and I loved it so much.
I think I remember seeing this trope at least twice in some horror movies, but I don't remember their titles. It always gets my attention.
Basically the part of movies where the characters come to realise their whole life or perception of the world was a deception.
Example Spoilers:
I knew nothing about The Island and that reveal was amazing
Gonna watch the movie thanks to your comment. :3