To listern to my ipod shuffle on take off and landing to help drown out the noises the plane makes this being the worst part of flying for me I'm not to bad once we are up there
As jno said, all electronic equipment off, on our way back from Boston a drunk chap kept refusing to turn his iPad off, he was threatened with having the police meet him at the gate.
They may not let you use earplugs. Most aircraft crashes happen during the takeoff or landing phases and they therefore like you to be able to hear any instructions.