At my friend's pet store, there was this large female rat. Seems that it was a "school project" and is completely tame, and even supposedly responds to its name "Delphi."
So I picked her up and she was as tame as anything I ever saw. I decided to relinquish her $5 adoption fee, as well as promise I would not use ehr as a feeder (which I won't.) So I am now the proud owner of a friendly female rat. She was "spoiled" and I guess she even got taken to the vet and immunized, etc, which is much more than can be said of some pet store rats!
I'll get pics soon. She is skunk colored.