Unlikely, but it could be a dwarf planet.
The Big Bang Theory Season 9, Episode 12
It's part of an UNLIKELY scenario
that involves sleepwalking...
The Big Bang Theory Season 4, Episode 2
becoming UNLIKELY friends.
The Big Bang Theory Season 7, Episode 10
That's what makes
their friendship UNLIKELY!
The Big Bang Theory Season 7, Episode 10
A decryption key needed
only in the UNLIKELY event
Westworld Season 2, Episode 7