Sagemind says... Agreed, both point I was I just about to make as well! Janus said: Meh, looks simple enough. I'll play the role of buzzkill and Captain Obvious. The two cats laying together clearly know each other well and trust each other. The third cat they either don't know, or they know that it is not friendly. However, it manages to get quite close in this video without them noticing. The striped cat finally notices it, jumps up and hisses, and runs off. The black cat is confused at first, then looks around and also notices the other cat, and likewise hisses and runs off. Most likely a territorial dispute. People do like to attribute human behavior and drama to animals.