My God that whole bit of doing that during Spanish class brought back memories. My first comic strip was drawn on the back of a Grade 11 A.P math midterm. It wasn't quite watercolours on the desk bold, but it was still pretty cheeky of me. Most teachers hated it when I doodled on my tests. My math teacher loved it, though, and encouraged me to keep drawing.
That was on 10 May 1988. I consider that date to be the anniversary of my drawing operation, Sam Studios.
Yes, I am old.