I remember reading on a website about how a few years ago (before the terrorism scares) some chap who was into computer games was playing a flight sim on his laptop, and sitting quite near the front of the plane. his speakers were turned up quite loud.

He let his attention slip and let the simulator plane’s altitude drop, and everyone ended up hearing

“WHOOP! WHOOP! PULL UP!”
“WHOOP! WHOOP! PULL UP!”

coming from what they thought was the cockpit

[this is part of an electronic alarm system found on all aircraft and is a Very Bad Thing to hear coming out of loudspeakers on an aircraft you are flying on!]

caused a bit of a short-term panic..

The cockpit staff actually saw the humour in this and just told him to use headphones, and after the flight they had a chat with him about which software it was and showed him round the real aircraft.

Of course you’d probably get arrested and sued these days..