It was years ago and I can't remember the details, but I remember I used some registrar's domain-name-availability widget and somehow the name had been "reserved" (not registered) in a way that meant they would change me more money, and I was somehow able to find some other thing that showed the reservation had happened right around the moment I searched.
I'm sorry I can't give better details, but I remember clearly the sense of "Now that's pretty fishy..."