I merely offer you a FACIAL expression
that suggests you've gone insane.
The Big Bang Theory Season 3, Episode 12
I don't particularly excel
at reading FACIAL expressions...
The Big Bang Theory Season 2, Episode 21
FACIAL prosthetic makeup,
and the grey hair and wig.
Westworld Season 3, Episode 8
...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