You know,
Italian housewives have a rule of THUMB:
The Big Bang Theory Season 2, Episode 9
If I'm going to jail, I'm killing him,
not breaking his THUMB.
The Big Bang Theory Season 9, Episode 14
...and then cuts off my THUMB?
The Big Bang Theory Season 3, Episode 13
...she licked her THUMB
to remove raspberry jelly...
The Big Bang Theory Season 4, Episode 3
that's the Pasadena City Police, but if
you broke my left THUMB, that's the FBI.
The Big Bang Theory Season 9, Episode 14