Your most useful class

Two high school classes:

1. Typing -- I signed up to take a semester-long personal typing class, but because of basketball practice ... er, I mean gym ... it wouldn't fit in my schedule. Instead, I had to take it for the whole year. I was going into engineering in college and never dreamed it would help me as much as it did. BTW, that class was on an electric typewriter.

2. Annual staff -- Got drafted onto the annual staff my senior year. When, after my engineering days ended, I decided to enter journalism, I had some knowledge of things like picas and what determines a photos impact on a page (size, content, placement).

Both serendipitous.