Sometimes flight crew get it wrong too.
"Ladies and gentlemen, this is captain so-and-so, blah-blah-blah, our expected arrival time in Porto Alegre is such-and such". General laughter. After a few seconds: "Ladies and gentlemen, seeing as we're departing from Porto Alegre, we expect to arrive in Campinas at such-and-such".
Another welcomed us aboard the flight to Rio de Janeiro and everybody looked panicky until he corrected it to São Paulo. Made me wonder if he really was preparing for Rio until someone gave him a heads-up.