Banner got in "trouble" at school last week for picking a hole in the dry wall at day care.
(Note: Not so much trouble. More like "and look what your kid did today".)
I'm pretty sure he was just trying to escape to the playground since his teachers have had to Banner-proof the classroom's door to the outside. The kid likes his freedom. And, much to everyone's dismay, has a knack for defeating all efforts at containing him.