Not my death, but it counts:
Battle has been going on for about two hours. In that time my units have fought off several reinforcements, had a number of good level-ups, and more than enough close calls. However, the boss of the map decided to to sit tight and wait for me to show up in order to charge instead. Caught flat-footed, I still manage to wound him heavily in an attempt to set up the killing blow for one of my weaker units.
However, all this effort is for naught, as the damn boss immediately flies over to my brand new troubador and one-shots her. WELP, TIME TO RESTART THE ENTIRE BATTLE.
Fire Emblem: Awakening. Sure, I could play on Casual and not worry about losing my units for good upon death, but where's the fun in that?