What The?

Riddle: There are eighty people riding a ferry. The ferry sinks in the middle of the Pacific Ocean. Eighty-four heads pop out of the water. How does this work?

Answer: It's not eighty-four heads, it's eighty foreheads. I bet I got you there. Source: https://riddles.com/index.php/2664

There are eighty people riding a ferry. The ferry sinks in the middle of the Pacific Ocean. Eighty-four heads pop out of the water. How does this work? — What The? by Jason Li Riddle