(Image credit: Nat Miller)
Digital cameras scan a scene from side to side to record an image. In panoramic mode, they scan quite a distance to capture, say, a landscape. But if someone, or something, moves while the scan is in progress, the result can be pretty weird.
(Image source: Panorama Fail)
You can't get pets to stand still for a picture, so they are ripe for scanning photography glitches. Which can be pretty funny.