
The last time
we went to the ZOO,
The Big Bang Theory Season 5, Episode 4

...as those that plagued Stu the Cockatoo
when he was new at the ZOO.
The Big Bang Theory Season 2, Episode 13

We go to the ZOO all the time.
The Big Bang Theory Season 5, Episode 12

I thought it smelled
like a petting ZOO in here.
The Big Bang Theory Season 10, Episode 8