When my children were small, we had a big siamese tomcat named Chang. He roamed the neighborhood freely and just came in for naps and bed time. One morning I went out and called him and another Siamese Tom showed up. Bobby said, "the wrong Chang came". The Wrong Chang immediately adopted us and was accepted by Chang. All of us called him Wrong Chang. He slept with the children but he had some distinct pecularities.

Wrong Chang had strong likes and dislikes. When he didn't like someone, he peed on their ankles. It was accomplished swiftly and then he ran off and hid. He hated my husband.
Everynight at dinner time, he ran by and peed on his ankles.
Bob gave chase but of course you can't catch a cat if he wants to hide. A lot of my friends got the same treatment.

Wrong Chang spent most of his time with us but we knew he had another home. I'll bet he was banned from his owner's house because of the peeing. The kids and I loved him and we always protested that he got into the house by mistake, but of course we let him in because we enjoyed laughing in secret about his antics.

When Bob and I got a divorce and Bobby and I moved away, We moved Chang. The neighbors all said that Wrong Chang sat on the steps for days, wanting in. I miss him still.