
Tell your boyfriend
to cool it with the COW jokes.
The Big Bang Theory Season 4, Episode 9

And a COW and a penguin.
The Big Bang Theory Season 3, Episode 10

or mad COW disease in my
grilled cheese sandwich?
The Big Bang Theory Season 5, Episode 16

Now, while commonly known as a COW catcher,
I prefer the more accurate "COW exploder."
The Big Bang Theory Season 8, Episode 21

"I bet Leonard never tipped a COW
over on himself."
The Big Bang Theory Season 4, Episode 9