The first time I ever gamed we played the Dragonlance Classics module Dragons of Ice. I played a half-elf ranger. I distinctly remember the roof of that inn in Tarsis being ripped off and sivak draconians descending from the skies. I barely remember anything else, as it happened in the winter of 1991 (I was 14).
I ran the module again in the winter of 1997 while I was in college. We were knee deep in the Classics campaign, and I was DMing two separate groups (one at home, the other at school), just like they suggest in the module (and just like it happens in the Chronicles books). We made it as far as Icewall/Silvanesti, and the campaign dissolved after that.
I also remember one of our first modules was Dymrak Dread, which I had the opportunity of dusting off for our new Age of Worms campaign. I had three adventuresome kids from Diamond Lake wander too far from town, close to the "Dymrak Cairn" as I dubbed it, which was inhabited by goblins. The kids were taken as slaves, and the PCs had to save them. They did this in-between visits to the Whispering Cairn.
I love dipping into old modules. I'd REALLY love to run Ravenloft 16/House of Strahd sometime again.