Mine was definitely my 8th birthday in the year 2001.
My birthday is September 10th & we all know the tragedy that occurred the next day.
We hadn't celebrated my birthday on the actual date (the 10th) because it was a Monday. My parents were out of town for the weekend were getting back that Monday night so my dad promised my sister & I that he'd take us to Chuck E Cheese's the next day.
I woke up instantly excited, constantly reminding my parents of their promise. When I got school, I remember thinking that all the adults in the building (teachers, secretaries, teacher's aids etc.) were acting funny. I don't really remember the teachers making a big deal about it, maybe because they didn't want to scare us so I went home still expecting to go to Chuck E Cheese's. Well when I got home, my parents were glued to the television not saying a word to us. I was so confused. Then my parents told me that we were going to celebrate because some bad men flew a plane into a building. I still didn't understand what was going on & not till a couple months later or so had I realized why everyone was so upset

There's mine. How about you guys?