- Just as CHALLENGING as you?
- Yeah...
The Big Bang Theory Season 10, Episode 5
Oh, we'll make the puzzles
extremely CHALLENGING
The Big Bang Theory Season 9, Episode 8
Intimacy in any form
has been CHALLENGING for me,
The Big Bang Theory Season 9, Episode 11
I know what a CHALLENGING man he could be,
The Big Bang Theory Season 9, Episode 14
Not CHALLENGING?
I was humiliating the man.
The Big Bang Theory Season 6, Episode 6