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

Fun with Flags.
The Big Bang Theory Season 12, Episode 23

"Traps." That's a FUN old word.
Where's that been?
The Big Bang Theory Season 12, Episode 19

Okay, have FUN.
The Big Bang Theory Season 7, Episode 15

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