Sounds like hell to me...
Only the other day I had the pleasure of sitting in a train with someone who was obviously designed at birth to be an annoying tw*t...
First he received at least 6 calls before we had even left the station, and had the worlds loudest, most annoying ringtone. It wouldn't have been so bad if he'd kept the phone to hand after the first call, but no, he buried in a pocket so we all got 15 seconds of his chosen "tune" each time...
Eventually we set off, and the calls stopped... Only for him to decide to use his phone as a mobile hifi unit and start playing some gangster rap through the tinny speaker!
Oh, and then he started to "sing" along with it!
I was half tempted to dig into the mp3 collection on my N95 and start singing Grace Kelly by Mika, cos I could really destroy that song, and I'm sure the 2 speakers on the N95 would have completely drowned out his crappy thing... But I resisted on the grounds that anyone singing gangster rap was probably "tooled-up".
Oh, did I mention this carriage on the C2C train was a designated "silent" one?
Thank God it was only a 20 minute journey for me, I don't even want to try to imagine what it would be like on a long flight... However at least one flight you can find a representative of the airline (easy to spot, they're usually trying to sell you scratch cards), who you can inform of you plan to murder a fellow passenger!