It really doesn't matter
as long as it's CHALLENGING.
The Big Bang Theory Season 10, Episode 22
The guy's a genius. Maybe you weren't
CHALLENGING enough for him.
The Big Bang Theory Season 6, Episode 6
- Just as CHALLENGING as you?
- Yeah...
The Big Bang Theory Season 10, Episode 5
Being your girlfriend is so CHALLENGING.
The Big Bang Theory Season 8, Episode 24
Intimacy in any form
has been CHALLENGING for me,
The Big Bang Theory Season 9, Episode 11