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

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

It's like me CHALLENGING you
to a sexy pants contest.
The Big Bang Theory Season 8, Episode 19

but the truth is,
Amy is just as CHALLENGING.
The Big Bang Theory Season 10, Episode 5

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