In this post, I had a heck of a time with the boolean AND operator (&&) because Blogger insisted on helpfully substituting & for each ampersand every time I edited the post in the Blogger composer. This happens even inside code and pre blocks, for some reason.
To make matters worse, on every edit (or even change between HTML and WYSIWIG modes), Blogger would replace its own &s with &, and so on, and so on. Yech.
It made me want to kick Blogger and take all its cookies. Okay, I'm sorry I said that, Blogger. I was mad. I didn't mean it.