I dreamed that cats were aliens from outer space. Most people didn't suspect anything. They just continued to treat cats as nothing more than beloved pets and companions, while the cats continued their scientific observations of Earth.
I was allowed onto one of the cats' concealed spacecraft. I was one of the few humans who so far had been allowed to come aboard and look around.
On board the spacecraft, the cats weren't dressed in white lab coats and speaking scientifically-inflected English. They still looked and sounded and acted exactly like cats, except that now it was a bit more obvious that they were interacting with the machinery.
I looked around and around and was unable to understand anything about the equipment, until, to my great surprise, I saw a familiar-looking computer terminal, with the number 448,000 in big numerals on a screen.
The cats were mostly communicating with each other with silent psychic messages, and I felt them silently urging me to sit at this terminal and work on a problem.
I could see easily enough that 448,000 is 7 times powers of 2 times powers of 10. I thought maybe I should just keep multiplying by 2 and by 10. So I typed 896,000 on the keyboard, 896,000 appeared in big numerals under 448,000, and I got strong psychic messages that I was doing well, that I was being helpful.
So I entered 8,960,000, and it also appeared on the screen, and I felt clearly that the cats were doing the equivalent of losing their straight faces and laughing at me. The whole thing had been a practical joke which had amused the cats cats very much. I wasn't angry, and even if I had been, several of them jumped up onto me and began to snuggle and purr.
The rest of my visit was very pleasant, with lots and lots of conventional Earthling-cat interaction. As I was getting ready to leave the spacecraft, I felt bad that I had been so utterly unable to figure out what the cats were doing and thinking, but I got a very strong positive psychic message that I had done just fine, and had no reason to feel inadequate. Several of the cats reinforced this message of positively and goodwill by jumping up onto me and patting my chest above my heart with their paws.