Have any of you known people who thought Lake Michigan was the ocean when they visited?

I've had this happen where I've had people visit and somehow they didn't know chicago was on a giant lake and said "wow I didn't know chicago was on the ocean". I've heard some uber drivers have had this happen too with tourists

EDIT: To spur some more discussion, turns out Lake Michigan actually does at times get reports of sharks. Bull Sharks, which can live in both salt and freshwater, have been reported up here. And Lake Michigan has occasionally gotten 15-20 foot waves and people have surfed here. And for those who think we don't have "real" beaches, we have a national park like 45 min from the city.