Lol, when I was around 8 years old, I accidentally deleted my dad's NSMB Wii save, and he didn't even bother to play again, because he already finished the game, star world and all, and he didn't want to have to take the time to do it all over again XD
When I was a kid, I accidentally deleted my ol' man's save file on Link to the Past, while opening a file for a friend. I swear, it is the only time in my life, where I looked at my dad and genuinely thought he was going to beat the shit outta me... A few years later, my girlfriend, at the time, deleted my Manhunt save file - I'd been playing on Hardcore. Looking back, and knowing how he must have felt... The ol' man would have been justified!When my daughter was very young, she deleted my Mario Kart DS save. I was bummed, i had worked hard on it. But it gave me a really good excuse to play again!