For me is when @Krunal_Sheth presented me the concept of canvas formula, i thought i knew everything on coda but at the time i had never used them 
Worth noticing is also when @maria , i think in the first lessons of the doctorate, showed my doc’s intro gif 
for me this maker community is problem solving and solution building made together, the most beautiful part of being here is finding people who worked hard on their ideas but got stuck in some “tricky” aspects.
Sometimes you’ve passed similar situations in other contexts, so then you can propose solutions that most of the times are more about tricking coda than something really new, and each of us have developed a different way to use coda, so at the end we end up with 3 ways to hack the system that all works, amazing 
In relationship to that, i have to admit that without @Paul_Danyliuk and his revolutionizing posts (and i’m referring to the beta period eh!) i wouldn’t probably ever seen coda as the magical tool that i see today, paul way of thinking out of the box totally inspired mine, so thanks for shaping this
Last, at this point i feel like i have to mention @Federico_Stefanato (the old profile 'cause at that point he was still on this side ) that have been the first Italian guy i had found on the community, companion of laughter and tears (mostly complaining about some coda directives lol), and my favourite Community Champion