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…
I’ve encountered a few sites that restricted repeating or sequential characters. Of course told after failing the first creation attempt. Makes things like randomly generated passphrases fun to figure out. Particularly when their idea of “sequential” involves both in alpha/numerical order, but also adjacent spacing on the (assumed?) qwerty keyboard!