My nomination for the worst user interface ever: #gnupg
I don't know even where to start
gpg: WARNING: no command supplied. Trying to guess what you mean ...
gpg: Go ahead and type your message ...
gpg: processing message failed: Unknown system error
gpg: signing failed: Invalid IPC response
gpg: [stdin]: clear-sign failed: Invalid IPC response
@saper what a clear error message
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@saper that's also true :P