To be honest: I have several #happythought -s and I can even see happy things in normal situations. But I think - your question is more specific :P
There is one most impressive childhood memory in my head:
My brother an me - playing on the beach in our france holidays. I just turned 10 / my brother was already 14 - we where building sand castles, go swimming, feel cool and surfer-style-like - eating ice cream - walk around the village, while our parents waited for the evening meal - and much more..
This was the time before my brother and me had some years of battling and annoying each other. But today everything is fine between us.
We where best friends back then and had much fun. These where the "good old days".
I will remind him this evening - when we meet :)If money would be no issue - I would do what I am doing in my freetime right now.
Having creative hobbies - working in my garden - making videos about all the stuff.
Just like now - without the 8h working every day :)
Super nice giveaway my friend ! Extremely positive way to make this kind of comment contest. All of us should remind the #happythought everyday :) I really like this and eventualy will adapt this kind of call for interaction and reflection :)