We found a cat outside tonight, which has apparently been one of the visitors that has my cats so interested in going outside each night. He looks and acts a lot like my Tiger - he was shy about not knowing me, yet at the same time wanted to be friendly. We brought him in at first, worried he'd run off and end up being a lost pet that someone was trying to find, but he went nuts, so we had to let him back out.
I couldn't help picking him up and petting him, and we set out food and water, so I think Tiger and Angie felt quite betrayed. It took me an hour or so before I won back their love.