
A decryption key needed
only in the UNLIKELY event
Westworld Season 2, Episode 7

Unlikely.
The Big Bang Theory Season 2, Episode 20

Unlikely, but it could be a dwarf planet.
The Big Bang Theory Season 9, Episode 12

...their love seems UNLIKELY
and doomed to failure.
The Big Bang Theory Season 8, Episode 7

becoming UNLIKELY friends.
The Big Bang Theory Season 7, Episode 10