
Hang on, let's talk about it. This is a
National Science Foundation expedition.
The Big Bang Theory Season 2, Episode 23

...I'm gonna get
a NATIONAL commercial.
The Big Bang Theory Season 3, Episode 12

at the National Accelerator..."
[inhales]
The Big Bang Theory Season 12, Episode 9

the National Belt Buckle Collectors
meet-and-greet.
The Big Bang Theory Season 10, Episode 19

that there was no NATIONAL
tricolored flag
The Big Bang Theory Season 12, Episode 13