Crazy Piano Player (& Climber)

So our M has discovered that she can make herself get higher. Last week it started with getting on the piano keyboard so she could get at her toothbrush. Now she's climbing from the couch and into the window, or onto another table so she can reach a drawer, or using her push-cart to climb onto a table to reach something she wants...much to her detriment. I'm continually amazed that human children survive to adulthood. They sure are super cute though! How do you discipline when they're making you laugh at the same time?!