The term apostrophe catastrophe denotes incorrect use or non-use of the apostrophe (') in a sentence.
Examples of apostrophe catastrophes:

We sell carrot's, parsnip's and potatoe's.

Its going to rain.

Johns coat and Marias bag were left on the train.

He grabbed the cat and started playing with it's tail.
by Fearman March 31, 2008
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The rapid spread of ignorance of the correct rules for apostrophe usage; the widespread misuse of apostrophes, especially in plural nouns.
Walk-in's Welcome; The Miller's invited us to dinner; Washing machine's for sale are all examples of Catastrophic Apostrophic Dysplasia.
by 21st Century Renaissance Man February 10, 2012
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