It went pretty well! We had a nice balance between "having fun playing the game" and "having fun making up silly jokes". We managed to finish a fairly huge chunk of the adventure (more than the DM planned) but also laughed our asses off. E.g. there was a VERY serious Paladin NPC, who wanted us to join his war against EVIL, and each time he uttered the word EVIL, we all sang "EVIL" as a choir of angels or something... by the middle of the game, we could do this in perfect unison. There were some pretty funny in game jokes as well. The same Paladin was also kinda racist. We had two dwarfs (dwarves?) in the party (a Fighter with an expertise in distilled spirits and my Sorcerer) and the Paladin kept mixing us up ("ya all look the same to me!") and asked whether we were related. My character, who had a bitter sense of humor, told him that he was the other swarf's father... "Don't serve him whiskey, he's underage" etc.
As far as D&D itself goes, the system was okay (D&D 3.5). The only thing that disappointed me was the underinspired spell list and the magic system as a whole. We consider switching to a different system, while sticking to the world of Forgotten Realms (which our DM loves).
Not sure if your DM will dig , but it's a non-vancian casting system I designed for 2E. If he uses Sanity points in his game, or is willing to introduce them, and fudge the numbers a bit to suit 3.5, it ought to work swimmingly. But it's not really a polished product, and it's definitely a matter of taste. I wrote it up because it works for my group, after all.