Another reason not to put your cell phone in your pocket.

Sydney, Australia (GMA)
   A passenger was on flight from Lismore to Sydney with an i-phone 4. Suddenly, without any warning, the phone began emitting a loud noise, began to glow cherry red, and gave off clouds of smoke!!! Luckily the phone was on the passenger's tray table and not in his pocket!!!
Protect your ass-ets,
Rodger  ;-P