
It's the CIRCLE of life, sweetie.
The Big Bang Theory Season 4, Episode 23
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"No, we don't wanna spend three months
stuck in a cabin in the Arctic Circle...
The Big Bang Theory Season 2, Episode 23

Quick, CIRCLE the airport.
The Big Bang Theory Season 6, Episode 24

And if anyone's a genius, it's me
for the way I brought that full CIRCLE!
The Big Bang Theory Season 10, Episode 9

I have a very wide CIRCLE.
The Big Bang Theory Season 1, Episode 1