
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

Not CHALLENGING?
I was humiliating the man.
The Big Bang Theory Season 6, Episode 6

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