It's usually not SERIOUS,
but it can produce a cough like that.
Breaking Bad Season 2, Episode 9
You can't be SERIOUS.
The Big Bang Theory Season 2, Episode 18
Fine, if that's what it takes
to show you that I'm SERIOUS.
The Big Bang Theory Season 12, Episode 2
Breaking Bad Season 2, Episode 10
Leonard, are we having
a SERIOUS conversation or not?
The Big Bang Theory Season 3, Episode 13