
No. But your THUMB does.
The Big Bang Theory Season 5, Episode 16

What happened
to your THUMB?
The Big Bang Theory Season 5, Episode 16

If I wanted to, I could wipe it out
with my THUMB like a god.
The Big Bang Theory Season 6, Episode 21

...she licked her THUMB
to remove raspberry jelly...
The Big Bang Theory Season 4, Episode 3

You know,
Italian housewives have a rule of THUMB:
The Big Bang Theory Season 2, Episode 9