
Empedocles thought he was a god
and jumped into a VOLCANO.
The Big Bang Theory Season 9, Episode 10

I'm like an upside-down VOLCANO here.
The Big Bang Theory Season 4, Episode 5

The VOLCANO thing? No.
The Big Bang Theory Season 4, Episode 5

Hawaii is a former leper colony
on top of an active VOLCANO
The Big Bang Theory Season 5, Episode 16