The Mishnah in Sukkah (5:1) says, “כָּל מִי שֶׁלֹּא רָאָה שִׂמְחַת בֵּית הַשּׁוֹאֵבָה לֹא רָאָה שִׂמְחָה מִיָּמָיו – Anyone who never witnessed the water drawing of the Simchas Beis HaShoeva never saw simcha his entire life.”
What made the Simchas Beis HaShoeva such an incredible event that it's one of the ultimate forms of happiness?