And the answer was ELEPHANT.
The Big Bang Theory Season 4, Episode 24
If I had an ELEPHANT
named Topsy,
The Big Bang Theory Season 11, Episode 8
It was kind of the ELEPHANT
in the room, so...
The Big Bang Theory Season 6, Episode 19
from an ELEPHANT
that died of syphilis.
The Big Bang Theory Season 5, Episode 16
You're like those ELEPHANT seal pups...
The Big Bang Theory Season 8, Episode 23