
I'm not seeing anyone
using liquid HELIUM vortices like this.
The Big Bang Theory Season 9, Episode 16

Hey, in your super-cooled
HELIUM experiments,
The Big Bang Theory Season 9, Episode 16

One time my brothers
made me breathe HELIUM.
The Big Bang Theory Season 12, Episode 6

"Helium."
The Big Bang Theory Season 2, Episode 5