Markdown italics with underscores look good in preview but not in answer
I just ran into an interesting markdown bug with previews that I thought I'd throw out there in case it's new.
There's Test::More's eq*deeply() function, which will also display exactly where the structures differ, or Test::Deep's eq*deeply(), which doesn't require a test harness (and just returns true or false).
Somehow the underscore characters are being interpreted as start italics/end italics.
EDIT: I can't seem to reproduce the appearance here. In the preview pane here on meta it looks like it does in the original post, but after posting, it comes out wrong (the asterisks are visible). Clearly it's not possible to demonstrate a bug in markdown using markdown :)