
"The CHALLENGING
climate of Scandinavia
The Big Bang Theory Season 12, Episode 23

The guy's a genius. Maybe you weren't
CHALLENGING enough for him.
The Big Bang Theory Season 6, Episode 6

- Just as CHALLENGING.
- Yes.
The Big Bang Theory Season 10, Episode 5

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