You know,
Italian housewives have a rule of THUMB:
The Big Bang Theory Season 2, Episode 9
so if you broke my right THUMB,
The Big Bang Theory Season 9, Episode 14
...she licked her THUMB
to remove raspberry jelly...
The Big Bang Theory Season 4, Episode 3
I had lost a lot of THUMB blood.
The Big Bang Theory Season 5, Episode 16
If I'm going to jail, I'm killing him,
not breaking his THUMB.
The Big Bang Theory Season 9, Episode 14