Years ago I was on a flight with an aborted initial landing - it wasn't fun. If it's followed by a rough landing I could see why some passengers might freak out. We were all in shock, though the pilot had explained the situation. Tough to explain to those who haven't experienced it.

A friend told me he was seriously spooked by the pilot saying on approach in Pakistan, "Inshallah, we shall be landing safely in a few minutes." His reaction was: "What the hell's with the uncertainty here!"