I have multiple email addresses and don't use a specific one every time, so I have managed to lock myself out of many orgs because I just can't remember which email address I used.
If you click the "forgot my email" link, they go "have you forgotten which email address you used to log in to which org? Just tell us your email address and we'll tell you which orgs it's logged in to", which is exactly the opposite of what I want!
It's such a clusterfuck that I just avoid joining new orgs nowadays because I know I'll never be able to log in again.