
And the answer was ELEPHANT.
The Big Bang Theory Season 4, Episode 24

What could
an ELEPHANT
The Big Bang Theory Season 5, Episode 10

from an ELEPHANT
that died of syphilis.
The Big Bang Theory Season 5, Episode 16

ELEPHANT?
The Big Bang Theory Season 7, Episode 2

Yeah, he electrocuted
an ELEPHANT named Topsy
The Big Bang Theory Season 11, Episode 8