
Sheldon gave me a brain teaser.
It's kind of FUN.
The Big Bang Theory Season 11, Episode 12

Relax.
They're just having FUN.
The Big Bang Theory Season 12, Episode 20

and then you are good to go.
Fun time.
The Big Bang Theory Season 5, Episode 18

It should be something FUN.
The Big Bang Theory Season 1, Episode 16

the bar looks like FUN.
The Big Bang Theory Season 7, Episode 1