In recently discussing the possibility of playing the Tomb of Horrors module as a one-shot, I suggested the idea that we use characters picked from Deities and Demigods just for kicks. Sure we could use the ones included in the back of the module, but I thought it might be interesting and a little humorous to see how someone like Sir Gawaine or the Gray Mouser might do down there. My friend declined, though mostly because he’d like to run his own characters through it one day never having played it before.
The conversation later had me thinking about what other quick and dirty gonzo one-shots I could come up with using the old 1st edition stuff. In retrospect, I can’t believe I didn’t do more of that kind of thing as a kid. I remember we did overrun the village of Hommlet with a high level thief and my friend’s assassin's guild, but that was more sadistic than gonzo really.
I can see mashing together some old stuff. Maybe you step through a door and are transported to a wholly different TSR module, then a few doors later, you teleport back to the original, or yet another one - a sort of 1st edition medley of modules that would really test the memory. Or perhaps to their surprise, all the inhabitants of one module are suddenly teleported and dropped into the various dungeon or rooms of another… G3 becomes S3. Running monsters as PCs and turning the table and having them invade various settlements would be fun. A handful of giants against the Keep on the Borderlands?
I’m committed to our regular games but these ideas would be a fun break for everyone, or something a potential new player might be interested in as a one-shot (lacking the ability to commit to a longer campaign). More than that, using the old stuff like this could give me the extra time I sometimes need for the regular game's design.