Not that anyone here will get this joke but... Here goes:
Welcome to MS DOS, chalkmongoose
cmd>ftp ftp.riaa.org
cmd>username: [email protected]
cmd>User is anonymous, now logging into server
cmd>Welcome to ftp.riaa.org
cmd> quote user ftp
cmd>Command successful
cmd>quote cwd ~root
cmd>Welcome back, root.
cmd> quote pass ftp
cmd>Password is now pass...
cmd>Thank you, and a have a jolly day...
And if you didn't get it, don't worry. Back when the FTP protocol was in infancy, a group of elitist black hats decided to take apart the manuals and see if any holes could be found.
One of the funniest holes they found was on *nix ftp servers, where by accessing a system with anonymous users allowable, you could take control of the system.