The worst cut-and-paste error I ever made.
I was editing a printed listing of LGBT events in New Jersey. Each month I’d clone last month’s listing and use it as the basis for the next issue.
Due to a cut-and-paste mistake, a sentence from last month somehow got retained and merged into an unrelated event for the new month.
The resulting sentence was something like:
[name of group] will be hosting an educational lecuture about
LGBT family law, and other countries it invaded in World War II.”