There's got to be a CLUE
here somewhere.
The Big Bang Theory Season 12, Episode 2
The next CLUE
must be hidden
The Big Bang Theory Season 7, Episode 3
The sole CLUE:
"It's not what it looks like."
The Big Bang Theory Season 5, Episode 1
I hope that's a rhetorical question
because I have no CLUE.
The Big Bang Theory Season 6, Episode 1
The CLUE must be
in the bag.
The Big Bang Theory Season 7, Episode 3