The xkcd password requires the use of spaces as legal characters. For some reason, this is still an issue with the majority of orgs with complex password requirements.
I practically see red when they tell me I can’t use spaces in my password. What kind of clown car are you idiots running over there?
I worked for a government agency who banned @, because it would SQLi and break their Oracle-based LOB apps when you logged on and when they synced your password in the clear.
correcthorsebatterystaple isn't much worse
*correct:battery-horse,staple. is a lot better though.
much more difficult to recall without the aid of a passwd manager