I occasionally see someone posting a picture asking if it's AI and they've gotten significantly better over the past months/year, to the point where I often wouldn't be able to easily tell.
The last picture I saw depicted a kitchen in a snack bar and looked convincing to me. The major tells pointed out by other people is that there was too much clutter and that things were in the wrong space for a kitchen, something you wouldn't really know if you don't have any experience with working in one.
Pictures require more examination. Videos are relatively easy. On 2/5/26, if the video shows something amazing and is under 10 seconds long, it's AI.
If the video seems plausible, watch anything in the video that moves. For instance, there was a video of a bear attacking a scary Halloween decoration, but as the bear moved, parts of him subtly changed shape. Somehow most people didn't notice it.
Also look for connections, where one thing meets another thing and there is movement. Also, look for impossible fluidity. AI is terrible at this. For instance, someone uploaded a video of a child who had fallen into a gorilla enclosure. The gorilla picked up the child and reached up and handed the child back to someone who was leaning over the wall. Picking up the child was far too smooth, and when the gorilla handed the child over, it actually wasn't holding the child at that point, and, again, it wasn't messy enough. From the moment the gorilla bent over the child, the child moved up and into the hands of the adult in one fluid motion.