He wants to stay in his crib and jump around saying "boin-gee, boin-gee" and falling on his blankets. He loves it.
One day last week I took him out before he was done and he got mad at me, so I took all his blankets out and threw them on the floor and then left the room. He got really quiet and when I went back to check on him, i found this:
It didn't take long, though, until he escaped to play elsewhere: