Somewhere between tool using
and CAVE painting...
The Big Bang Theory Season 1, Episode 11
There's a CAVE painting in France
of one of my ancestors doing this:
The Big Bang Theory Season 4, Episode 23
I don't ever want to leave
this CAVE, Jon Snow.
Game of Thrones Season 3, Episode 5
It's not safe outside the CAVE.
Game of Thrones Season 6, Episode 2
You died in that CAVE.
Game of Thrones Season 7, Episode 4