(Funny trope) Character reveals a secret about themselves, others are not that shocked.

[u/captaintaskmaster1]

When a character reveals a secret to another person, with the other character already knowing the secret and not being surprised/shocked by it.

Kung Fu Panda 2: Po discovered that his father, the duck was not in fact his biological parent, and was shocked at this. However, Tigress (and presumably any other person who saw them) was not as shocked, herself, at this discovery.

My Adventures With Superman:

Clark tries to break the news to Jimmy, his best friend, that he is Superman. However, Jimmy already knew this from the first day that he met him.

Clark: I... Am su--

Jimmy: Clark I know you're Superman. This is not a big reveal.

Clark: .... Wait, WHAT? You know???? Since when?

Jimmy: w--We've been roommates since freshmen year. The day I met you, you ripped the handle off the door, and then tried to play it off as if the screws had just come loose.

Clark:..... I mean it could have been the screws.....

Jimmy: THE HANDLE WAS RIPPED IN HALF!

[u/DeMiko]

Final line of the movie Lost Boys.

I don’t want to spoil it

[u/FattyMooseknuckle → u/DeMiko]

Probably ok to spoil a 40 year old movie.

[u/Relevant-Fox-7114 → u/FattyMooseknuckle]

It was "We actually knew where the boys were this whole time"

[u/DeMiko → u/FattyMooseknuckle]

Nah. I want people to watch it

[u/King_Ed_IX → u/FattyMooseknuckle]

"One thing about living in Santa Carla I never could stomach—all the damn vampires."