my original theory that space time
was like a super-cooled LIQUID,
The Big Bang Theory Season 9, Episode 18
Breaking Bad Season 2, Episode 4
The world's most boring LIQUID
and the world's most boring vegetable,
The Big Bang Theory Season 10, Episode 13
The correct answer is, "When covered by
LIQUID sufficient to reduce the coefficient...
The Big Bang Theory Season 2, Episode 5
Careful, Leonard. Liquid nitrogen,
320 degrees below zero.
The Big Bang Theory Season 1, Episode 5