The walking ladder is a extra wide ladder which you can walk on, and you can also balance on the top rung and start juggling while walking along with the ladder, it looks impressive, but if you fall it can be quit nasty! But if you still don't understand then look at the pictures below. There is a few gags which you can do with a walking ladder, for example you can lean the ladder up against a person then climb up it onto a tall unicycle.