Rain.
The Big Bang Theory Season 5, Episode 6
Tramping through the trees
in the RAIN, day after day,
Game of Thrones Season 1, Episode 5
...and you're living in a refrigerator box
and washing your hair with RAIN water?
The Big Bang Theory Season 2, Episode 14
Gonna RAIN soon.
Game of Thrones Season 4, Episode 3
Your words fall like acid RAIN
The Big Bang Theory Season 7, Episode 17