One of the weirdest things I ever saw was about 3 or 4 summers ago. I opened the backdoor one warm night for some reason and poked my head out. There is a motion-activated lamp on the porch and it kicked on and illuminated the front of the garage. There was my cat nose-to-nose with a very large possum. No hostility. They were sniffing each other in curiosity and I caught them at the right moment. If only I'd had a camera. Neither was prepared to attack the other and after a moment, the possum padded away into the shadows of the backyard rather jauntily and my cat followed right behind him like he does with any cat that comes into the yard. About a half-hour later, he pawed at the front door so I let him in. He jumped up on the couch and laid down and acted like nothing unusual had happened and I suppose it wasn't for him but I found it rather unusual and humorous. It makes wonder what things my cat has seen while on his peregrinations.