I was 19 and my younger sister was 17 when she applied to a university in another city. Everyone in the family kept saying how talented she was, how she would go far, how she was the "bright one." I had failed an entrance exam that same year and was pretending not to care. One afternoon, while using the family laptop, I saw her acceptance email. I don't know what came over me. I deleted it and then cleared the trash folder too.
She eventually found out through a phone call from the university, so thankfully I didn't ruin her future. She assumed it was a technical issue and still believes that today. She is 26 now, doing incredibly well, and she calls me whenever she doubts herself because apparently I'm the brother who "always believed in her." Every time she says that, I feel smaller.