First time I encountered the "counter too large" error. I had been numbering subsections in my diary with letters, like 1A, 1B, 1C, ..., and I had a diary entry so long it was 29 subsections.
how did I live without mango before I'm so glad I don't have to deal with other people's unwrapped lines ever again
"If you look inside good software, you find that parts no one is ever supposed to see are beautiful too."
Actually it still spooks me that growing up, I never noticed the English expression "long time no see" does not follow English grammar at all.
Maybe teaching an intro class is actually just being like a tour guide.