When Did "One Off" Take Off?

[Lombro2]

This question seems to have caused some displeasure resulting in some censure.

Unfortunately, I was unable to read what was said so I'll put the question here with the appropriate Google Ngram.


When did "One Off" take off?

[Sam Flynn]

Here's one of my favourites, namely "spread(ing) mayhem"

[Iconoclast]

One of my favourites too. Looks like 'spreading mayhem' has never been popularly recorded in the books sampled by Google Ngrams (which the Viscount L. has shown escalated rapidly in the 20th century, somewhat biasing against the 19th century).

[Lombro2]

"One off" took off in 2000.

So the question is, Why did this fact cause my fellow debunkers so much vexation, to the point of spreading "mayhem" in the sense Edgar Rice Burroughs used it in Tarzan of the Apes in 1912?