He's using PSYCHOLOGICAL warfare.
We must reply in kind.
The Big Bang Theory Season 1, Episode 13
...and PSYCHOLOGICAL implications
on human society.
The Big Bang Theory Season 3, Episode 11
Yeah, she's right. For every Newton
who had a PSYCHOLOGICAL issue,
The Big Bang Theory Season 9, Episode 10
One is a deep-seated
PSYCHOLOGICAL disturbance,
The Big Bang Theory Season 12, Episode 8
if you can't unload your
PSYCHOLOGICAL sewage on her?
The Big Bang Theory Season 9, Episode 19