The entire meaning of a sentence can be undone by a typographical or proofreading error.
But the verbiage that results can certainly be funny.
And in this age of auto-correction, there's a whole new dimension to typos, like “Blessed are the meek, for they shall irrigate the earth.”
Drummond Moir collected a bunch of good ones in his book Just My Typo.
Join us and share your favorite typos when Drummond visits the Exchange.