this next part may contain
some ADULT language.
The Big Bang Theory Season 10, Episode 11
Leonard, I'm an ADULT,
I know how to conduct myself...
The Big Bang Theory Season 8, Episode 23
Uh, well,
as a responsible ADULT,
The Big Bang Theory Season 11, Episode 9
I'm an ADULT.
I think I can handle it.
The Big Bang Theory Season 12, Episode 6
You're an ADULT who can't get by
without an allowance from his parents.
The Big Bang Theory Season 10, Episode 16