![- You lucky duck.
LEONARD: Heh.
- You lucky duck.
LEONARD: Heh.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
- You lucky DUCK.
LEONARD: Heh.
The Big Bang Theory Season 1, Episode 14
![I do. I tested their object
permanence with a rubber duck,
I do. I tested their object
permanence with a rubber duck,](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
I do. I tested their object
permanence with a rubber DUCK,
The Big Bang Theory Season 12, Episode 17
![...I told Amy that her hair
reminded me of a duck caught in an oil spill.
...I told Amy that her hair
reminded me of a duck caught in an oil spill.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
...I told Amy that her hair
reminded me of a DUCK caught in an oil spill.
The Big Bang Theory Season 8, Episode 4
![I was just talking to Siri
about Peking duck,
I was just talking to Siri
about Peking duck,](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
I was just talking to Siri
about Peking DUCK,
The Big Bang Theory Season 5, Episode 14
![You lucky duck.
You lucky duck.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
You lucky DUCK.
The Big Bang Theory Season 12, Episode 3