Ricin.
It's an extremely EFFECTIVE poison.
Breaking Bad Season 2, Episode 1
one of the most EFFECTIVE
techniques for moving on
The Big Bang Theory Season 7, Episode 20
I described your lovemaking
as aloof, but EFFECTIVE.
The Big Bang Theory Season 4, Episode 20
SHELDON:
It was obviously EFFECTIVE.
The Big Bang Theory Season 1, Episode 16
that saying "pew, pew, pew"
isn't as EFFECTIVE
The Big Bang Theory Season 5, Episode 19