
...is a SERIOUS disease, which could lead
to congestive heart failure.
The Big Bang Theory Season 3, Episode 11

(chuckling)
Oh, you can't be SERIOUS.
The Big Bang Theory Season 5, Episode 21

Serious mistakes.
Game of Thrones Season 8, Episode 2

- You really think he's SERIOUS?
- That's why I'm here, Saul.
Breaking Bad Season 3, Episode 12

Come on, be SERIOUS.
The Big Bang Theory Season 7, Episode 23