
If I'm going to jail, I'm killing him,
not breaking his THUMB.
The Big Bang Theory Season 9, Episode 14

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

General rule of THUMB,
Game of Thrones Season 7, Episode 3

...and then cuts off my THUMB?
The Big Bang Theory Season 3, Episode 13

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