I just locked myself out of SSH. Basically, I added three users to /etc/ssh/sshd_config using the AllowUsers directive, which is great because now they can login, but now I can't, and I'm the only user on the sudoers list.
I would happily do an "su" from within an SSH session of one of those users I just added, but I do not have the password for my account, only a .pem certificate file.