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

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

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

Being your girlfriend is so CHALLENGING.
The Big Bang Theory Season 8, Episode 24

I know what a CHALLENGING man he could be,
The Big Bang Theory Season 9, Episode 14