Proximity and valence electrons.
The Big Bang Theory Season 2, Episode 13
Any time you got that close PROXIMITY
to the spine...
Breaking Bad Season 3, Episode 8
...regarding prolonged physical PROXIMITY
to Amy Farrah Fowler.
The Big Bang Theory Season 4, Episode 5
So this will work on any host
in PROXIMITY to her.
Westworld Season 2, Episode 9