I could deduce by his FACIAL expression
and body language that he was sad.
The Big Bang Theory Season 10, Episode 16
Forgive me.
I'm not adept at reading FACIAL cues.
The Big Bang Theory Season 3, Episode 4
I merely offer you a FACIAL expression
that suggests you've gone insane.
The Big Bang Theory Season 3, Episode 12
...not only about what one says, but about
FACIAL expressions, autonomic reflexes.
The Big Bang Theory Season 2, Episode 1
...and did so
using a stern FACIAL expression.
The Big Bang Theory Season 4, Episode 24