Same as with Joey, my favorite moment so far is my first Quidditch practice, which was also my tryout for the team. Most, if not all, Spiffies were there and had no qualms about terrorizing me how Marcie and Lilly will torture me, how many points I'll have to reach, etc.
But, luckily for me, everything turned out just fine and I got accepted into the team! So, by far, this is my favorite Quidditch moment. That and all the shenanigan we get up to during practices