This evening we heard a colossal thump from the kids' room and found Lukasz laying face down on the floor (he wasn't hurt... somehow). Tom asked what happened and Lily said "He fell off the bunk bed ladder." Tom asked why he landed face first if he'd been on the ladder. Lukasz said he just decided to let go and he fell. I picked him up and he clarified for us: "I was just trying to walk in the air."