...the PRINCIPLE that a physical system exists
partially in all its possible states at once.
The Big Bang Theory Season 6, Episode 19
The anthropic PRINCIPLE states...
The Big Bang Theory Season 6, Episode 1
...and I avoid contact with other people
on general PRINCIPLE.
The Big Bang Theory Season 3, Episode 15
That's sort of like
the uncertainly PRINCIPLE.
The Big Bang Theory Season 4, Episode 20
of Heisenberg's
uncertainty PRINCIPLE,
The Big Bang Theory Season 5, Episode 5