Fun trick (I don't know if it still works): on the login prompt of your Linux (or other Unix) machine, type your username in all caps. This sets some strange termios(3) modes, which convert all lowercase output to UPPERCASE and all UPPERCASE input to lowercase. These modes are, AFAIK, for compatibility with these uppercase-only terminals.
(I tried it on a regular Linux virtual terminal (as is my normal way—I don’t use a graphical login manager), with my password in correct/inverted/upper/lower case, none work. It’s conceivable a pam module could make it work or something like that. I’m not investigating.)
