Aggregating and editing abstracts for a chemistry conference. Researchers entered their abstracts into a wildly broken custom chemistry conference abstract editor, which produced a file which would be sent to me. I imported the non-broken files, did my best to fix the broken ones (among other oddities, the software could
write a file containing a 64 kB image, but couldn't
read such a file), then scanned through for obvious typos and spelling/grammar errors (a large proportion of the submitters were not native English speakers).
Two good things came out of this experience: First, I learned a lot of chemistry (I remember asking my father, who was one of the conference organizers "so... what exactly is a Highly Frustrated Magnet, anyway?"); and second, my commentary on the abstract-processing software contributed to it not being used in future years.