...and did so
using a stern facial EXPRESSION.
The Big Bang Theory Season 4, Episode 24
This calls for an
EXPRESSION of gratitude.
The Big Bang Theory Season 5, Episode 20
but I think I'm just an EXPRESSION of...
The Big Bang Theory Season 9, Episode 11
I merely offer you a facial EXPRESSION
that suggests you've gone insane.
The Big Bang Theory Season 3, Episode 12
Where did the EXPRESSION
"got your ass handed to you" come from?
The Big Bang Theory Season 6, Episode 4