I spent 8 hours trying to fix a bug once because notepad used smart quotation marks (really showing my age here - and now I'm pretty annoyed that the instructor was telling us to use notepad, but it was 2001 and I didn't know any better).
I did something like that once too, a long time ago. And because of that I see syntax errors of such I’ll within seconds now, having learned once the hard way.
This was about a million years ago. I had just installed a pirated copy of Windows XP (FCKGW-RHQQ2...) and was in the first quarter of my physics degree, taking a class in C. Different times....