My nephew hates flying and he was persuaded to go on holiday to Majorca, the plane developed a fault and the pilot told the passengers he would have to dump the fuel and return to the airport. All the passengers were praying and crying and there were lots of F'ing and blindings especially when they had to brace before landing. They were all escorted off the plane and had to wait a couple of hours before being put back on it. He said that he almost didn't go back on.
It does happen, and not all of them are publicised.