four leaf clover, n.Definitions

The Four-leaf clover is unlucky among clovers because they always get violently plucked when a big killer giant finds them.

The Four-leaf clover usually means that he will have good luck if its found by an ambitious man.

The Four-leaf clover is rare because whenever someone picks one, it eliminates the mutation from the gene pool.

A Four-leaf clover is increasingly rare because to pick one is to reduce their numbers, and thus to tell evolution that it is bad to be a four leaf clover because you will be killed immediately unlike the three leaf clovers.

A Four-leaf clover is not something that makes you lucky. It only signifies that you're lucky enough to find a four-leaf clover.