
Really? What was your first CLUE?
The Big Bang Theory Season 2, Episode 10

I hope that's a rhetorical question
because I have no CLUE.
The Big Bang Theory Season 6, Episode 1

So, the part where he got stood up
didn't CLUE you in?
The Big Bang Theory Season 10, Episode 16

Okay, the CLUE
must be in the bag.
The Big Bang Theory Season 7, Episode 3

a fun and imaginative CLUE
The Big Bang Theory Season 7, Episode 18