The guy's a genius. Maybe you weren't
CHALLENGING enough for him.
The Big Bang Theory Season 6, Episode 6
I know what a CHALLENGING man he could be,
The Big Bang Theory Season 9, Episode 14
- Just as CHALLENGING.
- Yes.
The Big Bang Theory Season 10, Episode 5
but the truth is,
Amy is just as CHALLENGING.
The Big Bang Theory Season 10, Episode 5
Oh, we'll make the puzzles
extremely CHALLENGING
The Big Bang Theory Season 9, Episode 8