It was kind of the ELEPHANT
in the room, so...
The Big Bang Theory Season 6, Episode 19
Yeah, he electrocuted
an ELEPHANT named Topsy
The Big Bang Theory Season 11, Episode 8
And I will return to New Delhi in triumph
atop a bejeweled white ELEPHANT.
The Big Bang Theory Season 6, Episode 20
And the answer was ELEPHANT.
The Big Bang Theory Season 4, Episode 24