It really doesn't matter
as long as it's CHALLENGING.
The Big Bang Theory Season 10, Episode 22
- 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
but the truth is,
Amy is just as CHALLENGING.
The Big Bang Theory Season 10, Episode 5
wow, a CHALLENGING time,
to put it mildly.
Breaking Bad Season 2, Episode 10