Found posted in a humor newsgroup (rec.humor.funny)
The following is an ad from a real-life newspaper which appeared four
days in a row - the last three hopelessly trying to correct the first
day's mistake.
MONDAY: For sale: R.D. Jones has one sewing machine for sale. Phone
948-0707 after 7 PM and ask for Mrs. Kelly who lives with him cheap.
TUESDAY Notice: We regret having erred In R.D. Jones' ad yesterday. It
should have read "One sewing machine for sale cheap. Phone 948-0707
and ask for Mrs. Kelly, who lives with him after 7 PM."
WEDNESDAY Notice: R.D. Jones has informed us that he has received
several annoying telephone calls because of the error we made in the
classified ad yesterday. The ad stands correct as follows: "For sale
-- R.D. Jones has one sewing machine for sale. Cheap. Phone 948-0707
after 7 PM and ask for Mrs. Kelly who loves with him."
THURSDAY Notice: I, R.D. Jones, have no sewing machine for sale. I
smashed it. Don't call 948-0707 as I have had the phone disconnected.
I have not been carrying on with Mrs. Kelly. Until yesterday she was
my housekeeper but she quit!