One is that the perfect garden can be created overnight, which it can't.
In college, before video games, we would amuse ourselves by posing programming exercises.
I still have a full-time day job, which is why it took me five years to write An Ear to the Ground, and why I won't have another book finished by next week.
One of my most productive days was throwing away 1,000 lines of code.
A well installed microcode bug will be almost impossible to detect.
I wanted to avoid, special IO for terminals.