What a nice idea @Oaktree
I could really use some happy memories right now. One that i remember was in tech studies in year 9. Now I was never really one to speak up in class, I always sat in a corner and kept to myself. It was during this class when we were having a class discussion and the teach asked the class what the definition of 'light' was. Without even thinking i just blurted out "Something you can see in the dark." Everyone laughed and the teacher was impressed. It felt good. I had spoken up and hadn't made a fool of myself, which is what had always stopped me. The teacher then asked me a few tings about what my interests were and I said "space". I was a big space and astronomy nut since I was a little kid. So he asked me a few technical questions hat i still remember. How far is an AU, and what is the distance of a parsec? I got both right. I knew the AU (distance between the Earth and the sun), and the Parsec was an educated guess with "4 light years". It's 3.26 light years. Everyone was so impressed, including the teacher. I've never forgotten it. It was one of the first times i remember just speaking up without being directly asked and got lucky enough to get asked questions on my favourite subject. It felt nice to be the centre of attention for the first time I could remember, with a room full of people listening to what what was saying.
Also, finding a $5 note on the walk to the local shops one day when I was about 10 was an awesome day as well.