Teddy Bear Cholla is often called “Jumping Cactus.” No they do not actually jump, but often they will make you think they do. They have segments which easily detach from the plant and if you brush up against one, they will attach its self to you. Once you get one of these segments stuck in you, the only way to remove it is with pliers or a couple of sticks, or something along that line.
Photographed west of Phoinix at the Skyline Regional Park, Buckeye, Arizona.