- That's so SILLY.
- It's actually based on very sound theories.
The Big Bang Theory Season 1, Episode 16
because of some
SILLY Roommate Agreement.
The Big Bang Theory Season 5, Episode 15
Don't be SILLY.
The Big Bang Theory Season 5, Episode 10
Sheldon, this is SILLY.
I'm not missing another prom.
The Big Bang Theory Season 8, Episode 8
Don'’t be SILLY,
you don'’t have to call a cab.
The Big Bang Theory Season 12, Episode 4