Context is that I had to register for a lot of accounts recently and some of the rules really make no sense.
Not name-and-shaming, but the best one I've seen recently is I might have accidentally performed an XSS attack on a career portal using a 40-digit randomly generated password...
My favorite is a major credit card company with case-insensitive passwords. They also only allow a small handful of special characters, so the total possible character space is roughly 42 characters. Needless to say, I chose to use a password that was the maximum allowed length (which was sadly also only 32 characters).