It's like a waterfall
of LIQUID gold.
The Big Bang Theory Season 5, Episode 1
How about a LIQUID cooler?
A little aquarium pump here.
The Big Bang Theory Season 1, Episode 2
Careful, Leonard. Liquid nitrogen,
320 degrees below zero.
The Big Bang Theory Season 1, Episode 5
The world's most boring LIQUID
and the world's most boring vegetable,
The Big Bang Theory Season 10, Episode 13
You see, instead of
using LIQUID helium...
The Big Bang Theory Season 11, Episode 8