Ricin.
It's an extremely EFFECTIVE poison.
Breaking Bad Season 2, Episode 1
that saying "pew, pew, pew"
isn't as EFFECTIVE
The Big Bang Theory Season 5, Episode 19
I was able to take
an EFFECTIVE shot.
Breaking Bad Season 2, Episode 3
SHELDON:
It was obviously EFFECTIVE.
The Big Bang Theory Season 1, Episode 16
I described your lovemaking
as aloof, but EFFECTIVE.
The Big Bang Theory Season 4, Episode 20