There are always seven Wonders of the World. If one is destroyed, an unranked Wonder ascends to the Seven. However, knowledge of which are the Seven Wonders was lost in the 16th century.
There will never be thirteen British monarchs with the same name, since it would unleash a constitutional crisis as to whether the last should be designated XIII or XIIb.
When attempting to produce a statement that could plausibly be true, but probably isn't, the probability that additional statements will enter outright lie territory rises in proportion to the 2.5th power of the number of statements made thus far.
The word "chicken" originated as a contraction of "chick-to-hen," describing accurately the lifecycle of the bird, which, uniquely, has no male of the species.