Pole Vaulter

I don't know WHAT to do to keep Chase in his bed. EVERY night, he & Izzy have a party, including illegal contraband (books & clothes that I find in her crib in the morning), dancing, and races from one end of their bed (or crib) to the other. Our recent attempt at keeping him in there was adding an extra saftey rail so that it virtually had walls like a crib. To NO avail.... Last night, only 3 minutes after I tucked them in, I went in real quickly to put something away. The second I opened the door, I saw Chase stop & stare at me like a deer in headlights, race over to his bed, and jump in doing a perfect horizontal pole vault, all the while exclaiming that he "didn't do it" & that it was "an accident." I couldn't even scold him. I had to leave the room, I was laughing so hard.