
I hear locomotive smoke
is the second LEADING cause...
The Big Bang Theory Season 8, Episode 22

The one who was LEADING them...
Game of Thrones Season 1, Episode 6

As opposed to the LEADING
nonsteroidal anti-inflammatory,
The Big Bang Theory Season 12, Episode 17

LEADING a train
of meticulously restored
The Big Bang Theory Season 7, Episode 15

LEADING to his first
scientific breakthrough--
The Big Bang Theory Season 7, Episode 10