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
...indicating he's CHALLENGING
the ruling on the field.
The Big Bang Theory Season 3, Episode 6
Oh, we'll make the puzzles
extremely CHALLENGING
The Big Bang Theory Season 9, Episode 8