I'm just gonna hang out with my mom.
That's always FUN.
The Big Bang Theory Season 3, Episode 4
Big deal.
Not knowing is part of the FUN.
The Big Bang Theory Season 4, Episode 18
You could have FUN with that.
The Big Bang Theory Season 5, Episode 10
it's okay to have FUN
once in a while.
The Big Bang Theory Season 5, Episode 3
Oh, that sounds like FUN.
The Big Bang Theory Season 1, Episode 1