Castor bean
Castor bean extract (ricin) is nasty stuff.
An ingenious, if not insidious, ploy was hatched by the KGB when they hollowed out the tip of an umbrella. Inside the umbrella was a tiny ball bearing which had perforations in it to inject ricin in to. This was used to quietly assassinate dissidents once loyal to Moscow.
Once the agent had his mark , he would walk behind him and act as if he casually bumped the umbrella against the target's leg. In reality, he fired his
ricin dart directly in to the mark's leg.
Anyway, I realize that was a tangent
but the point was mostly about how nasty ricin is.
“There is something which unites magic and applied science while separating both from the 'wisdom' of earlier ages. For the wise men of old the cardinal problem had been how to conform the soul to objective reality, and the solution had been knowledge, self-discipline, and virtue. For magic and applied science alike the problem is how to subdue reality to the wishes of men: the solution is a technique; and both, in the practice of this technique, are ready to do things hitherto regarded as disgusting and impious" -C.S. Lewis