A friend sent me a link to a video and said "you'll probably like this" (btw, it was Hubert Dreyfus on AI, and I haven't watched it yet), so I went there, clicked on the "Watch it now using RealPlayer", and was informed that I "must upgrade" my RealPlayer. So I clicked OK, and eventually there was a registration page which I didn't care to fill out, but I didn't see any obvious way of skipping it, so I filled it in with garbage.
I filled in the email address as f***you@f***you.com, and submitted that. It came back with an error message saying "That email address is already registered."
I tried f***everyone@f***you.com. Same error.
Then (IIRC) f***allthisf***ingsh*t@f***you.com. Finally, the installation continued. And you know, I completely overlooked the possibility that f***you.com was probably a real domain (which it is, of course). That domain sure must get a lot of registrations :-)