Listen to her mischievous laugh!!  She knows I don't like her to climb up the stool.  When she sees the stool is out she rushes over to climb up.  She does that with other things too.  I have blocked off the stairs with the playpen so when the playpen is pulled away from the stairs she rushes over to climb the stairs.  Sometimes she crawls so fast that she biffs it.  It's pretty funny.  She's crawling and her head gets ahead of her hands so she lands on her chest and her arms end up underneath her. :)