Making Fidel Castro's beard fall out...LOL
What's even funnier is that it was in real life a plan, not by David Ferrie, but the CIA, in addition to their scheme for embarrassing Castro by spraying the air ducts of the station where he made his weekly radio broadcasts with a hallucinogenic drug to cause him to have an acid trip and make a fool of himself on the air.
Imagine of either of those had come to fruition :)