Or when the rule says 8 characters including numbers and symbols. You add "$" in it and it says "nope not that symbol.
At my work you can't use ! @ or $ because they look like letters. Mine used to be "$to!3nC@r22 (stolen car 22) and when I went update it to 23... "nope, can't use ! @ or $ anymore".
I remember my first attempts to get into CPF. I'd see "click on pictures with a bird" I'd do that and get "nope, incorrect, click on pictures with a car".... same results. Bicycles, steps, traffic signals, boats etc. When I finally got in I posted 3 different times but it took a couple of days for my posts to be approved. By post 10 I was ready to say "never mind" but my first three were approved so no more of that crap.